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!

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
Vendor: CheapBatteries.com
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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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.)

seybertooth5 months ago

it is in the tutorial on how to create an instructable

Ibwise5 months ago

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

nlewkowitz5 months ago

Cool concept.

my4pop16 months ago

Very nice liked. I hope you the further development.

smartmiltoys6 months ago

Amazing Led Throwies! I love it!

Thanks to author.

PatrickBishop6 months ago

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

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

curly gurly7 months ago
This is so cool and creative!
Tbus7 months ago

This is so much fun! I'm studying a learn-at-home basic electronics course http://www.ciebookstore.com/basic-electronics-cour...
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!

ZombTech8 months ago

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

how long will the batteries last?

davidbarcomb9 months ago

Very nice project and well explained tutorial. Thanks

StumpChunkman9 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!


TheGeek198411 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.

TfhRober1 year ago

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Thats sweet

Jan_Henrik1 year ago

Very cool i like it!!! :)

Its amazing

mousepaper1 year ago

Thats superb

mousepaper1 year ago

Extremely good

Its tremendous :)




fastbobble1 year ago

Its spectacular :)

gorgeddamp1 year ago

Thats wonderful...

This is awesome!

illrings1 year ago

Its splendid :)

airbugger1 year ago


Or you may order magnets from www.hobber.ro

It has over 230 neodymium and ferrite magnets

Thats one awesome

Neodym1 year ago

and if you'd like to get the best price:


headlymph1 year ago


tealrink1 year ago


Thats nice


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