The 8-1/2" flank cinch is made with natural skirting leather.  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.