Features: Made from metal material, this hand warmer provides long lasting warmth. Its compact size allows for easy portability, so you can stay warm wherever youare. Suitable for those who enjoy outdoor activities like sports competitions, camping, fishing, and picnics. Also great for heating up your workspaces during the cold months. No batteries or power source required. Perfect for outdoor enthusiasts, office worker, senior, and campers. Specifications: Item:Catalysts Hand Warmer Part Size:approx 3.3cmx1.5cm/1.3x0.59in Materials:Metal Package Types: 1PC / 2PCS Package Includes: 1PC/2PCS Catalysts Hand Warmer Part note: Please allow 1-2cm errors due to manual measurement, please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.