A special foam combination provides optimal comfort and stability for extended playing sessions. The DW 9100M Series Round Top Throne has a 14'' diameter and is equipped with a double locking clamp to ensure the seat height remains in the same place every time you play. The seat's height can be adjusted from a minimum of 20'' to a maximum height of 27''. The DW 9100M throne features a vise lock seat clamp which keeps the seat and legs firmly together, offering maximum stability and durability.