LP Aspire Entry-Level Quality HeadThickness: approx. 1 mmHead Height (as new): approx. 30 mmMaterial: Untanned buffalo hideRim Fit: All Highline/Aspire EZ Curve bongo hoops in the appropriate size.Also suitable for CP601 Combo BongosNote:Despite the crown diameters of 7" and 8.5", please only use the original Aspire heads. The outer diameter of the Hand Picked and Matador versions is slightly larger, causing the head to clamp into the EZ hoop.Remo original heads for Aspire have a slightly slimmer aluminum hoop.For this reason, the sizes remain at 6 3/4" and 8"