Description: Features: brand new and high quality Perfect for cold days and cold days at office or at home. Use when skiing or in cold weather and also when at home. Gel pad that crystallizes once the metal disk is clicked releasing heat. Reusable, boil in a pan of boiling water for 3-5 minutes. Snapping the internal starts to generate instant heat, reaching up to 60 degrees. Great for: Hand foot warmer, heat pack, body warmer, heat therapy, joint back pain, outdoor, hunting How to use: 1. Forcibly activate the heating plate. The iron plate is very stubborn and you have to press and hold the center. 2. The sheet metal material reacts chemically with the liquid and generates heat (solidification of the liquid) as the product begins to generate heat. 3. After coagulation, place the bag in boiling water and heat for 3 to 5 minutes. Till the crystals inside dissolve completely. 4. Remove and allow to cool to room temperature. They are then ready for use again and again. Specification: Material: PVC Heating time: about 28 minutes Maximum temperature: about 60 Diameter: app. 10cm(3.94in) Color: As pictures shown. Optional Pattern: 1,2,3,4,5,6,7,8 Quantity: 1 pc Note: Transition: 1cm=10mm=0.39inch No retail package. Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1 x Hand Warmer Pack(other accessories demo in the picture is not included.)