reusable pvc hot pack - CE,FDA,MSDS,USP51,61,TRA approved - no external power - supply oem reusable pvc hot pack 1.CE,FDA,MSDS,USP51,61,TRA approved2.no external power3.supply oem, could be made with your size, shape, printing, packing, etc Instruction For Use for heat pads:To activate:1. Find and grasp the metal disc between thumbs and forefingers. Gently flex the metal disc back and forth until ...