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. Please note when ordering that items with asterisks (**) are special order items that require an extra 5-7 days for shipping. Expedited shipping is not available on those items.Item is not available for international shipping.