The Stiffi Barrel is made from advanced Aerospace Materials – Carbon Fiber. At 1.7 - 3.0 ounces, Stiffi Barrels are 3 to 7 times lighter than Metal Barrels. Stiffi's MicroJeweled bore creates a hi-tech polymer glass- like finish giving you unparalleled accuracy. All one-piece Stiffi Barrels have a Stepped Bore for less ball drag and better shoot-through on barrel breaks. Will not expand and contract with temperature changes, giving you consistent accuracy. Precision machined aluminum backs in all popular bore sizes.