Remo R-Series Skyndeep Bongo Head Calfskin 9 in. A synthetic head that will fit most full sized bongos and Remo R-Series bongos Skyndeep is the graphic infusion of pigment into the polyester surface of the head, making it uniquely attractive while maintaining the integrity of a great sounding drumhead Skyndeep is weather-resistant, produces warm tones, and increases sound volume and projection in any environment Traditionally, drums like congas, bongos, and djembes have drumheads made with animal skins These have worked very well for many hundreds of years and are still used on many drums