Championship K-55 Cushion Rail Rubber 47" (9' Table) Set of 6 K55 rails are more often used on carom tables and most coin-op tables . As a long time leading supplier of Cushion Rubber to the Billiard Industry, Championship has had an ongoing research and development program to produce the best quality and most consistent playing billiard cushions made today. After consulting with professional players and leading polymer chemists, Championship has developed a line of billiard cushions that set new industry standards. To insure that Championship's strict testing criteria and tolerances are met, we developed our own American Made tooling. Championship's tooling, “state of the art” manufacturing facility and strict quality control measures assure maximum integrity of formula and proper cure of each and every production run. The result is a line of Billiard Cushions with exacting tolerances required in durometer, dimensional accuracy, rebound, specific gravity elongation and overall performance. Both of Championship's billiard cushions, Mercury and Pro-Am, came within BCA standards for accuracy 100% of the time at all three speeds. None of our competitor's billiard cushions that we tested came close to demonstrating the accuracy Championship's billiard cushions achieved. You can't beat 100% accuracy.