50 Rounds – 147 gr. With Shell Shock Technology NAS3 Two-Piece Shell Technology Engineered for the future: 50% lighter and 2x stronger than brass Outperforms nickel-plated brass on every level Uniform wall thickness + proprietary assembly techniques = reliable and consistent velocity, 0.93 fps standard deviation (see SST Independent Test Report) Re-loadable Ejects cool to touch Made in the USA Dimensions 5.0625 x 2.625 x 1.3125 in