This item is a 10-pack of .22LR senstive "baby boomers" You mix the catalyst and main compound, then place into the individual targets. They have two-sided tape to adhere them where you want them to stay. Very cool reactive target for those on a budget!

H2 Targets are legal in 49 States (except Maryland), with restrictions that include but not limited to the following:

Once mixed it is considered an explosive material so you can not transport it or store it without proper licensing (it must be mixed and shot on site within a reasonable time).
Once mixed it is considered an explosive material so do not re-sell mixed product or use mixed product for commercial purposes unless you are licensed to do so.
Before use check your local, state, and federal regulations for areas approved for the use of this product.