Once inserted into either the knee or wrist elasticated wrap, they deliver deep comforting heat for up to 8 hours and provide targeted temporary relief to arthritis pain. Cura-Heat Arthritis Refill Packs are air-activated heat packs designed for use in either the knee or wrist elasticated wrap of the Cura-Heat Arthritis Pain products. With no need for preparation, just open the sachet and insert the heat pack into either the knee or wrist wrap pockets. The comforting heat can help relieve the pain and aches associated with arthritis in the joint area by increasing blood circulation. Non­medicinal, portable and discreet - Cura-Heat Arthritis Pain for Knee & Wrist can be used anywhere. Available as a 6 pack.