Crocodile Creek Kids Eco Reusable Solar System Ice Packs for Lunch Boxes (Set of 2), Blue, 5" Ice Packs are 5"H x 5"W x .25"D. Two per set Interior liquid is 98.5% purified water, 1.5% Polyacrylate. Exterior is 15.7% Polyamides and 84.3% polyethylene Keeps lunchbox cold for at least 4 hours. Freezes solid in 1 hour and 45 minutes Reusable, non-toxic, kid safe Hand washing recommended, Lifetime manufacturer warranty