Code drum products are purpose-built, designed by drummers for drummers. They have matched time honoured and trusted manufacturing techniques with up to date cutting edge technology to produce a new premium range of drum heads and accessories. Plus, all materials used to manufacture Code products are 100% recyclable. Code Port Holes are a UK made quality product, made from compressed UPVC foam board, with a self-adhesive backing. Designed to assist in cutting a mic port hole in your reso head, reinforce the cut, and provide added projection to your bass drum sound. Available in Black or White, in sizes 4", 5" and 6".Oxygen Music is proud to stock a wide array of Code Drum products such as the CHPRTHLWH41.