Reusable therapeutic hot or cold gel pack with full instructions on the reverse for treating sore muscles and minor injuries. Heat in a microwave for 30 seconds or freeze and apply either hot or cold to the affected area. Will stay warm for up to 90 minutes and remain cold for up to three hours once frozen. The pack contains gel that is non-toxic and it can be reused many times. A production lead time of 10 – 15 working days applies to this product.