Original replacement heads for Toca Freestyle Djembes;Material: untanned goatskin (low-odour);Tuning system: mechanical;Compatible with Freestyle 2 Rope Djembes (synthetic head);Tip:You can find the replacement head numbers on the sticker on the inside of the shell. Please watch out for correct size, material and tuning system.;Head determination by measuringAverage diameter [mm] (crown diameter/head overall diameter):9″ (243/267)10″ (254/284)12″ (290/317)14″ (354/384);