Neiko 30263A Sanding Pads 6-Inch Velcro Face Hook and Loop for Random Orbital Sanders, 1 Piece Velcro face design with hook and loop function provides easy closure for removing disc without wearing out overall strength Fast and durable oscillating speed operates at 10,000 RPM withstanding high frequency to achieve a consistent, smooth finish High quality polyurethane material construction used for variety of applications tailored to be either rigid or flexible but never stiff Universal standard backing pad size 6" x 5/16" with 24 threads is durable and fits most air sanders in woodworking, garages, or industrial settings