Have convenience and safety with these non-toxic, high quality microwavable heat packs. Therabeads conform to any contour, giving a soft, snug fit and do not saddle like many heat packs due to their superior construction. Made up of tiny hydroscopic beads, which retain their moisture for up to 30 minutes, and provide moist heat at the correct levels for effective therapy. Supplied with case. Therabeads are made from hydroscopic aluminium.