Danco 61261W 3/4 Dielectric Union Washer 1-3/8" Od.x15/16" Id. X 3/32", Ten Pack JOINT PAIN RELIEF - Applies constant pressure to the joint, providing effective relief of acute and chronic pain from patellar tendonitis and arthritic knees MAXIMUM SUPPORT & MOBILITY - The Patellar (Kneecap) Stabilizer allows for full mobility of the knee joint while improving lateral and medial support for weak and arthritic knees IMPROVED KNEE PERFORMANCE - Improves patellar tracking resulting in less knee degeneration, inflammation, and pain