The Model 3581 is the Big Brother 37mm version of our revolutionary Super-Sock12ga Bean Bag Cartridge. This large version also delivers unprecedented accuracy and consistent terminal impact characteristics at close, medium and extended ranges. When deployed, super-sock presents a consistent aerodynamic shape every time resulting in consistent and predictable terminal performance. The Models 2581 and 3581 Super-Sock is a revolutionary beanbag cartridge that delivers unprecedented accuracy and consistent terminal impact characteristics at close-in and extended ranges. This is made possible by the flexible tubular material bag specially developed for this round. Super-Sock is a safer and more effective round due to its accuracy and consistent transfer of kinetic energy to the target. No frisbee or wind surfing effects. Super-Sock is correctly deployed as soon as it exits the muzzle. No unfolding is necessary as with traditional flat bags. 12 gauge rounds sold in packages of 5 and 37mm as single units. Specifications: Model 2581: Load-Sock, Projectile Wgt-40gm, Total Weight-56gm, Velocity-280fps Model 3581: Load-Sock, Projectile Wgt-60gm, Total Weight-155gm, Velocity-250fps Compatibility: Model 2581: Cylinder and improved cylinder 12ga., Shotguns chambered for 2.75 and 3 cartridges. Model 3581: All standard 37/38mm launchers