Picture of LED Throwies
Developed by the Graffiti Research Lab a division of the Eyebeam R&D OpenLab, LED Throwies are an inexpensive way to add color to any ferromagnetic surface in your neighborhood. A Throwie consists of a lithium battery, a 10mm diffused LED and a rare-earth magnet taped together. Throw it up high and in quantity to impress your friends and city officials.

Click on this link to see the LED Throwies in action in NYC thanks to resitor and fi5e!
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Step 1: Materials List

Picture of Materials List
LED throwies consist of only a few inexpensive parts and can be made for ~$1.00 per Throwie. You can reference the parts list below or download the attached spreadsheet for more info on parts, part's numbers, vendors and application notes.

Part: 10mm Diffused LED
Vendor: HB Electronic Components
Average cost: $0.20 avg per LED
Notes: Cost reductions for larger quantities. Comes in red, blue, amber, white in both diffused and clear. Diffused works better than water clear for the Throwie application. HB has even created a Throwies packs page with deals on 10mm LEDs and lithium batteries!

Part: CR2032 3V Lithium Batteries
Cost: $0.25 per battery
Notes: Cost reductions for larger quantities. With the 2032 Lithium batter, depending on the weather and the LED color, your Throwie should last around 1 -2 weeks.

Part: 1-inch wide Strapping Tape
Vendor: Your local hardware store
Cost: $2.00 for one roll
Notes: One roll will make many throwies

Part: 1/2" Dia x 1/8" Thick NdFeB Disc Magnet, Ni-Cu-Ni plated
Vendor:Amazing Magnets
Cost: $13.00 per 25 magnets
Notes: Cost reductions for larger quantities

Part: Conductive Epoxy
Vendor: Newark In One
Cost: $32.00
Notes: The epoxy is optional.
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Kirbsome!5 years ago

Throwies on steroids -

7 LEDs arranged in a ring
LED Ultrie.jpg

Hello! Do you have an instructable for this one? I want to apply something similar for a soft toy I'm making, just took my first steps on LED 'wiring' yesterday and your solution seems to fit what I had in mind... without entering into Arduino land _I'm not ready yet! Thank you :)

so simple yet so powerful

I have great news, you are today's winner of the "I Made It" Challenge for the month of june. Thank you so much for being a part of the instructables community and encouraging authors to post more projects!

For winning you are receiving a 3 month pro-membership.
I have posted a how-to on making throwies with removable tabs where you can pull it out to turn the LED on and slide it back in to turn it bad off. It's not very hard to implement, and is quite useful for conserving battery power.

Here's the link:

I'm also working on throwies that automatically turn on upon sticking to something and off when they are removed (as suggested above), and I have a few prototypes working but there are still some bugs to work out.
Q-Branch (author)  everythingdigital9 years ago
I have included your how-to on the G.R.L. Throwies site and in the upgrade section of the throwies instructables post. Thanks so much for the mods and looking forward to the next rev!

Best quote: "Throw it up high and in quantity to impress your friends and city officials."

How long do they last?

Unknowable. Friends can be fickle, and city officials often disappear once installed.

not sure city officials would be that impressed.

fun with LED throwies
GwyneddS13 days ago

I made one for my hair! It won't last long because it's so many LEDs, but it's fun for now. Just used electrical tape and a paperclip.

thowie clippy 2.jpgthrowie clippy.jpg
Harrys628 days ago

you so much for sharing this type of wonderful post. I really appreciate your
post much time. Buy our rubber matting & rubber flooring from

Cool project! I've made also some basic reference posters to jumpstart your electronics. I hope this might help: :-)


HelenR2 months ago

I don't want to be a party-pooper, but those lithium batteries are lethal to children. So you might want to think carefully about where you put these things.

Conor M HelenR1 month ago

Hopefully there mums/dads are good parents and wont let them eat them

Snellingkorey4 months ago

My dog would love this, can you make it dog proof?

You should try involving it in heat-shrink tubing (that thing that you heat up and it shrinks to about half its size) but it won't stop it from eating the throwie, so be careful with that...

I agree with Monthrax, you can't really make this dog proof!

Can anything be truly dog proof? (I suppose you could put it in a small solid plastic box but it depends on the size of your dog.)

seybertooth2 months ago

it is in the tutorial on how to create an instructable

Ibwise2 months ago

will study this may be what I need to make dollhouse lights

nlewkowitz2 months ago

Cool concept.

my4pop12 months ago

Very nice liked. I hope you the further development.

smartmiltoys3 months ago

Amazing Led Throwies! I love it!

Thanks to author.

PatrickBishop3 months ago

This will be perfect for parties. Will try it soon :)

It's good that LED light can be put everywhere now

curly gurly4 months ago
This is so cool and creative!
Tbus4 months ago

This is so much fun! I'm studying a learn-at-home basic electronics course
and this is a great supplement project. I'm going to tell my instructor to check this out and maybe he can include something like this for a future lab. Thanks Q-Branch!

ZombTech4 months ago

Made them, Threw them, had an awesome time :)

how long will the batteries last?

davidbarcomb6 months ago

Very nice project and well explained tutorial. Thanks

StumpChunkman6 months ago

I've loved and used this tutorial for years. I hope you don't mind, but a friend and I wanted to make a song that centered around a tutorial, and this seemed like an ideal candidate. Thank you so much!

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TheGeek19848 months ago
Ah...LED Throwies...I remember, way before I signed up with Instructables, I was bored and surfing the internet, and I stumbled upon an article that had the main picture from this 'ible, and all the fun things you could throw them at and make them stick. Then there was a link, so I clicked it. Best. Decision. Ever. This was the first instructable I ever read, and the first I ever built. I would throw them at my front door and use the square patterns as sort of targets, like a game.

What was the first instructable you read/followed?

excellent idea, you could really make a statement at Christmas with these.

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