Step 1: 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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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)  everythingdigital8 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?

Kirbsome!4 years ago

Throwies on steroids -

7 LEDs arranged in a ring
LED Ultrie.jpg

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.
fun with LED throwies
syedsaad23 days ago
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TheGeek19841 month 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.

TfhRober2 months ago

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paverphalange3 months ago

Thats sweet

Jan_Henrik4 months ago

Very cool i like it!!! :)

motherprune4 months ago

Its amazing

mousepaper4 months ago

Thats superb

mousepaper4 months ago

Extremely good

Its tremendous :)



amazedgreen4 months ago


fastbobble4 months ago

Its spectacular :)

gorgeddamp4 months ago

Thats wonderful...

clearedeager4 months ago

This is awesome!

illrings5 months ago

Its splendid :)

airbugger5 months ago


bulbdesigner5 months ago

Or you may order magnets from

It has over 230 neodymium and ferrite magnets

Thats one awesome

Neodym5 months ago

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

headlymph5 months ago


tealrink5 months ago


grousebandit5 months ago

Thats nice


harechubby6 months ago


jiffymanager6 months ago


jiffymanager6 months ago


ritchie566 months ago

May I make a suggestion. LEDs by definition do not regulate the current passing through them. In other words, if you don't limit the current passing through them with a series resistor, then they will allow as much current to flow through them as the battery can deliver. The LEDs you mention have a maximum current limit of 25mA (0.025A). The button batteries can delivery 10x that much current in a short period. The result will be a very shortened LED life and a burned out battery. Red LEDs drop about 2 volts and the battery can deliver 3 volts, so a 50-ohm series resistor is in order (for a safe 20mA current flow). The blue and green LEDs need 3-3.6 volts to operate and would require 2 batteries stacked together to produce 6 volts. For blues and greens I would use a 130-ohm series resistor. By doing this, the LEDs will illuminate much longer. The resistor can be put on the positive or negative side of the battery between the battery and one of the LED leads.

calmlunch6 months ago


calmlunch6 months ago


clapfilk6 months ago


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