The Triple K 310 Belt Holster is custom fit for black powder revolvers. Made of top grain cowhide and features durable tear resistant stitching. Good leather stretches slightly with prolonged use. Since Triple K's leathers are the finest, they allowed for the natural expansion of the holster body by tightening the fit during the molding, bonding, and stitching of our holsters. A secure, safe fit is therefore always assured. The fit is so tight it seems that gun was made for the holster.