Umarex Elite Force 6mm .25 Gram Softair BB 5000 Pack. They are the highest quality BBs currently on the market and are designed for the serious player. The BBs come in both .20 gram and .25 gram versions for precision airsoft games. Perfect for milsim and police force training. Specifications for Umarex Elite Force 6mm .25 Gram Softair BB: Manufacturer: Umarex Number of Rounds: 5000 Length: 11.9 Projectile Caliber: .243 Caliber Package Contents: Umarex Elite Force 6mm .25 Gram Softair BB Umarex 2279506: Elite Force 6mm .25 Gram Softair BB 5000 Pack