Check the listing for details. R-Series Low Collar Skyndeep Drumhead - Bongo Drumhead 7.15''. Condition: New. Listed at 48.99 USD. The R-Series, Low Collar, Skyndeep Bongo drumhead is the ultimate combination of a great look while still maintaining the integrity of a great sounding drumhead. Skyndeep is the graphic infusion of pigment into a polyester surface making it uniquely attractive and providing a weather resistant drumhead with warm tones that increases sound, volume, and projection in any environment. The Low Collar construction is designed specifically to accommodate the various bongo drum manufacturing brands that are equipped with a radius counter hoop rim. This allows for a comfortable playing relationship between the counter hoop rims and playing surface. The design also reduces the amount of torque needed while tuning the drum and minimizes the tuning hook length that may stick out the base of the drum, something that drummers who play seated can really appreciate!