DEWALT DW4940 4-1/2-Inch Rubber Backing Pad with 10-Inch by 1.25 Locking Nut 4steel reinforced rubber backing pad Adds a great value Manufactured in China High quality raw materials for consistant performance Turbo rubber backing pads have spiral vents to keep disc cool and increase disc life Maximum rpm 12,000 One year warranty, one year service contract, 30 day no-risk trial