Instant Hot Pack quickly releases heat within 5 seconds when it's activated. ME1703 Instant Heat Pack requires no special handling or pre-heating as it can be activated by just squeezing it. ME1703 Rapid Heat Hot Pack can help expedite blood blow and promote the healing of injured area. Instant Hot Pack is convenient to use for sports injuries, and is non-toxic and non-caustic. ME1703 Instant Hot Pack is available in 100g, 200g, and 250g.