1.non-toxic 2.non-caustic 3.reusable 4.for refrigeration 1) It is available for keeping goods fresh during transportation,sports and medical treatment and so on, necessary as a good assistant in daily life. 2) Please place it in the freezer for 10 hours or more before using. 3) Reusable, Non-toxic, Non-caustic. rigid ice pack,ice box, ice brick