MP-40-F3
The MP-40-F3 discharges 3 foam rubber batons. The 17 gram batons are made of 30 durometer foam. 
For direct fire.

MP-40-R3
The MP-40-R3 discharges 3 hard rubber batons. The hard rubber batons are an effective replacement for wood batons, without the danger of splintering. These cartridges are designed to be skip fired.