The 9100 round seat has a full 14' round top and is made up of a special combination of foam for stability and comfort. The 9101 is identical to the 9100M, but with an extra-low tripod base for low-seated players. Minimum Height: 17.5" [44 cm] Maximum Height: 25" [64 cm] 

Features:

• The Double Locking Clamp ensures your seat height stays consistent.
• The Vise Lock Seat Clamp keeps the seat married to its legs.
• The Special Foam Combination provides superior stability and comfort.
• Newly-designed double-locking clamp
• Oversized 1-1/4" base for added stability