Remo R-Series Skyndeep Bongo Drumhead 7.15" CalfskinThe Remo R Series Skyndeep 7. 15" bongo drumhead with the Calfskin graphic is sized for the hembra position on R Series bongos. The calfskin pattern is embedded in the Skyndeep film, giving it a traditional look that holds up through playing without peeling. R Series collar fits R Series bongo hardware. Calfskin graphic gives a natural, traditional aesthetic. Plays like a standard Remo synthetic with the look of a skin head.