This air dry car dehumidifier is an eco friendly practical and economical way to keep your car interior dry the 2 bags absorb excessive moisture in the air preventing the formation of mould mildew musty odours and rust the activated pellets inside the bags absorb up to 60 their weight in moisture so each bag should remain effective for 2 4 monthsto reactivate simply place on a radiator to dry outtwin packeach measures 535 x 17cm