Standard MFG states the following feature set for their Thunderstruck double barrel .22 Magnum revolver, 

Caliber: .22 Win Mag

Capacity: 8 Rounds

Barrel Length: 1 1/4

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