This ammunition uses an exclusive polymer bullet coating to significantly reduce copper and lead fouling in the barrel, leaving no residue behind. It also effectively decreases lead buildup in suppressors by 60 to 80 percent. Both the Sub-Sonic and High Velocity loads feature a 40-grain round nose lead bullet with optimized geometry for maximum accuracy. With reliable CCI priming and consistent propellant, Clean-22 ensures flawless cycling through semi-automatics and all .22 LR firearms. The brand is CCI, falling under the category of Rimfire Rounds, with a caliber of .22 LR, model Clean-22, and series Subsonic. The bullet weight is 40 grains, and there are 100 rounds per box with a brass casing. Each box is packaged in a case of 50.