This is .22 Long Rifle SK Standard Plus 40gr. Solid Point Ammo. SK rimfire ammunition is manufactured to strict tolerances. Each individual cartridge is inspected at the factory and fifty cartridges from each batch are tested to make sure that the highest quality rimfire ammunition is reaching the consumer. This ammo has a muzzle velocity of 1050 FPS. It is packed in 50rd. boxes, 500rds per brick.