Made of high quality ABS, strong and durable. Protects alkaline batteries from pressure and impact, excellent abrasion and pressure resistance. Silicone rings effectively prevent dust and water from entering. Built-in EVA sponge reduces vibration, effectively absorbs impact, and protects alkaline batteries. It provides individual slots, preventing both ends of alkaline batteries from coming into contact with each other to cause explosion, ensuring safe storage of alkaline batteries.