1.Each qualify checked item with a unique Manufacturing Part Number label on the inner package to confirm if it is the authentic item sold from our store.
2.When you have any problems about your item ,please send us the MPN label information first

3.This ring keeps holes from spreading and also helps keep a thick, rich deep thump coming from your bass drum.
4.Made of silicone,soft and good quality.
5.The inner dia is 4 inch,5 inch,6 inch, meet your different needs.

Specifications:
Material: Silicone & Metal
Color: Black
Brand name: Mxfans
Size:
Ring: 10/12.5/15 x0.5 cm / 4/5/6 x 0.25 inch(Dia x Thickness)
Cutter: 13.5x1.5x1cm/5.31x0.6x0.4inch(LxWxH)
Weight: 130g

Package include:
3x Port Hole Rings
1x Hole Cutter