Adjustable Port Hole Rings For Bass Drums In Sizes 4", 5", And 6" Are Available Note:There is a little difference between the color and object. Features: 1. Durable silicone and stainless steel surround the port holes to strengthen them and avoid tearing the head,Implementing a simple microphone setup. 2. Available in three sizes 4inch/5inch/6inch to suit your application. 3. Bass Drum replicates the original Bass Drum snap-in design reinforcement system, adding durability and charm to transplanted bass drum heads. 4.Easy to install, just snap the O into the port hole to make your kick drum look complete. 5. The port grommet prevents the hole from spreading and also helps maintain the thick, rich thump from your bass drum. Package Content: Material: Silicone Metal Color: Black Brand name: Yibuy Size: Ring: 10/12.5/15 x0.5 cm / 4/5/6 x 0.25 inch(Dia x Thickness) Cutting part: 13.5x1.5x1cm/5.31x0.6x0.4inch(LxWxH) Weight: 130g Package include: 3 x Port Hole Rings 1 x Hole Cutting Each item is qualify checked with a unique Manufacturing Part Number label on the inner package,in order to confirm if it is authentic item sold by our store. Any question,please contact and send us the MPN label information. Product Features Durable silicone and stainless steel surround the port holes to strengthen them and avoid tearing the head,Implementing a simple microphone setup. Available in three sizes 4inch/5inch/6inch to suit your application Bass Drum replicates the original Bass Drum snap-in design reinforcement system, adding durability and charm to transplanted bass drum heads. Easy to install, just snap the O into the port hole to make your kick drum look complete. The port grommet prevents the hole from spreading and also helps maintain the thick, rich thump from your bass drum. Shipping: Shipping is complimentary within the lower 48 US States. We Do Not Ship to PO/APO Boxes, HI or Alaska We Do Not Ship Outside of the Continental US All items ship within 24-72 hours of Payment For large items that require Freight shipping a valid phone number is required to call and schedule your delivery Terms of Sale and Feedback: Feedback is extremely important to us and If you are satisfied with our transaction, please take a moment to leave Positive Feedback. YOUR Satisfaction is our #1 Priority! If there are any issues, PLEASE contact us BEFORE leaving a neutral or negative rating so that we may resolve any concerns. We PROMISE we can make you happy if you give us a fair chance. Returns / Concerns: All items qualify for returns within 14 - 30 days of receipt. Buyer is responsible for return shipping on any item that is not damaged Please be sure this is an item you want before making your purchase. Customer Satisfaction is our TOP priority! All items are IN STOCK at time of listing. Inventory changes constantly and it is impossible to maintain a perfectly accurate count of all items. Please do not penalize us if we have to issue you a refund! Thank You For Your Business!