The REACTRO Reusable Hot Gel Pack is a versatile, practical, and fun product to keep various items warm. It contains a state of the art gel which provides heat for extended periods. This is an economical product that can be used over and over again. REACTRO is available in a multitude of fun, exciting, attractive colors. It is the new quick way to create an instant portable oven to keep things warm. REACTRO Reusable Hot Gel Packs can be effectively used in lunch boxes, coolers, shipping containers, and buffets to keep prepared food and other items toasty warm for an extended time. It is ideal for catering companies and restaurants that deliver prepared items frequently like Pizza and Chinese food.