All Martin Saddlery flank cinches have biothane keepers for longevity. The contoured ends will not interfere with spurring. They are made of heavy saddle skirting with a latigo liner, sewn together with heavy nylon thread.  Then they are hand rubbed, edges are dyed, and borders are stamped.  Roller buckles are secured with copper rivets.  Sizes available are 2-1/2" and 4-1/2".  Available in natural skirting leather only.  Don't forget to add a flank cinch hobble strap to your order.