air activated hand warmer,heat pack,warmer environmental,non-toxic 8hours of warmth,twin packed ... portable air active 8hours hand warmer,heat pack,warmers heat time: 8hours Contents: Iron powder, water, salt, activated charcoal, vermiculite. Instructions1. Open the ... pack. 3. Shake lightly two or three times to generate heat. Caution1. Do not apply directly against skin as burns may ...