It doesn't contain any heavy metals and rare metals, no pollution.
STURDY BUILD - The Battery Case is High Impact Resistant and Constructed from Non-Conductive ABS Plastic. This Material is Highly Resistant to Shock, Vibration, Chemicals, and Heat.
CASE and BRACKET :12V 12Ah Battery Case,can hold 32PCS 18650 Cells
【What You Get】: 12V 12Ah Battery Case and 4pcs Battery Bracket
Value for money: our batteries case have more stable performance and higher power, and works well in various applications.