4 in x 8 in (10 cm x 21 cm). Moist heat therapy. Deep penetrating heat. Soothing relief of muscle aches & joint pain. Long lasting, up to 8 hours. 33% larger than regular. Individually sealed pads. Try BenGay pads with heat therapy - odorless, long-lasting, portable pain relief so you can get on with your regular activities. Made in Japan.