Remo's tucked heads technology is a process in which the film is wrapped around a steel insert ring just as animal skins are "tucked"; around flesh hoops. The results? Remo has created a more durable drum head that can withstand extreme amounts of tension that are needed for many of world percussion instruments. Type 9 heads fit most models of LP, Toca, Pearl and Remo bongos.Please allow 6-8 weeks for delivery.