Features: 1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information; 2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed. 3.Drum Screw Tension Rods: Made of high-quality iron material, lightweight and durable. 4.The bolt lengths are all appropriate sizes, you can easily tighten the drum head and get a good playing experience. 5.The drum head can be easily tightened for easy installation and removal. Ideal for drum repairs and refurbishments. .