Magnetic Knee support with open patellaSome clinical observations indicate that magnetic energy helps:1.improve blood circulation. 2. relax muscles and relieve pain.3. support biological healing.4. improve supply of oxygen and nutrients to muscles and tissues.Made of neoprene with ferrite magnets.Fastened to desired tightness by velcro hook closure.NB The pack photograph shows the support in black. It is actually blue and black.PLEASE VISIT MY SHOP toseea selection ofmy other items.I OFFER A NO QUIBBLE REFUNDGUARANTEE SHOULD YOU BE UNHAPPY WITH ANY PURCHASE.