These are printed in flexible TPU and are designed to be as safe and as harmless as possible while still being effective.

Drop them from 200 feet or higher to allow them to reach terminal velocity and produce sound.

The body has a hollow tube which needs to be filled with weights to have the correct balance and penetration through the air.

I use 3, 3/8 ball bearings for the weight but you can use whatever you have, as long as it makes it nose heavy.

push the ball bearings as far up to the nose as possible and glue in place

you can use “red snap crackers” available at fireworks stores for more effect, glue them to the nose or inside the tail.

 These can be re-used over and over.

print in a bright color so you can find them.

remove all strings and burs from whistle holes and chamber. 

DO NOT use these to scare or harm people or damage property

I am not responsible for any injuries or damage.

be smart, use at your own risk, and be safe.