The Tannerite 1 lb. Binary Brick Targets 4-Pack are for use with centerfire rifles with bullets traveling at 2,000 fps and include 4 binary exploding targets with 4 catalyst packs, a mixing container and a set of earplugs. The clear plastic jar targets feature white plastic lids and blaze orange labels for aiming. Each target is 3-1/4"H x 3-5/8" diameter.