Model: 637, Caliber: .38 S&W Special +P, Capacity: 5 Rounds, Barrel Length: 1.875" / 4.7 cm, Front Sight: Integral, Rear Sight: Fixed, Grip: Synthetic, Action: Single/Double Action, Frame Size: Small - Exposed Hammer, Finish: Matte Silver, Overall Length: 6.31" / 16.0 cm, Material: Aluminum Alloy Frame, Stainless Steel Cylinder, Weight Empty: 15 oz / 425.3 g