Thank you for your viewing.
1. Please allow 1-5mm error due to manual measurement.
2. The color of real item and the picture may be slightly different.
3. If your item has any problem, please keep it and contact us firstly.

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

Specifications:
Material: Silicone & Metal
Color: Black
Ring: 10/12.5/15 x0.5 cm / 4/5/6 x 0.25 inch(Dia x Thickness)
: 13.5x1.5x1cm/5.31x0.6x0.4inch(LxWxH)

Package including:
3x Port Hole Rings
1x Hole