NEIKO 30261A 5” Vinyl Face PSA Sanding and Backing Pad 5 16” Arbor with 24 Thread Mounts 10,000 RPM Ideal for Orbital and Dual Action Sanders 5" Size:5" you’ll always find the right Color:Black & Yellow 2 pack you’ll always find the right one for your job NOISE REDUCTION: This wall door stopper is made of high quality silicone rubber with optimum thickness to absorb the impact noise [PSA]: Blue pressure sensitive adhesive (PSA) backing design sticks onto flat vinyl surfaces and is most ideal for woodworking projects when used with orbital and dual action (DA) sanders [SPECIFICATIONS]: This universal standard backing disc size is 5" x 5 16" with 24 threads and strong with a rigid body to fit most air sanders for woodworking