Christmas Cozy Reusable Hand Warmer. Simply flex the internal disc and experience immediate warmth, with temperatures soaring up to 60 degrees. To recharge, just simmer in boiling water for a quarter of an hour, then set aside to naturally return to room temperature before the next use. Aside from using them as a hand warmer, you can also use them in relieving joint and muscle pains, tendonitis, arthritis, menstrual cramps, and more. Made from pvc material, measuring 4.72*4.13*0inches, this custom christmas cozy reusable hand warmer. Usage Scenarios: Office supplies, school stationery, corporate promotions, trade show giveaways. Customization available: Print your logo or customize packaging and color schemes. Product Highlights: Portable, durable, practical for daily use.