40-Pack of Techniche HEAT PAXTM Body Warmers. Work great inside our Techniche Vests, Neckwear, Blankets, Back Wraps, and Seat Cushions. Generate 20 hours plus of warmth. Measyre 3.5inches x 5inches (8.9 cm x 12.7 cm). Sold as One Box OfForty (40) Singles (9.5 lbs., 4.3 kg). Order One and recieve a box of forty Heat Pax.