The S333 Thunderstruck sets the standard for the ultimate in personal protection by simultaneously firing two rounds of .22 Win Mag with each pull of the trigger. With four pulls of the trigger eight rounds are fired in only three seconds. Specifications: Caliber: .22 Win Mag Capacity: 8 Rounds Barrel Length: 1 1/2" Cylinder Material: High Strength Steel System: Double Barrel Double Action Revolver Two Rounds Fired With Each Pull of the Trigger Frame Material: 7075 Aircraft Grade Aluminum with Anodized Finish Safety: Integral Articulated Trigger Safety Transfer Bar Blocks Firing Pins: From Hammers Barrel Material: Steel Grip: Polymer Weight: 18 oz