The Serenity 2000 Magnetic Knee Support is made of a top quality non fraying material far superior to the average neoprene, 34 X 4000 gauss strategically placed magnets, Wrap around design with hook & loop closure will adjust to knee size, Large size fits knees up to 26"" diameter at knee cap, With more than 6"" penetration this product is very effective for knee pain, weakness & stiffness, SKU: SEREN089