Dw Drum Workshop DWCP9100M 9000 Series Throne With Memory Lock Overview:

The 9100 round seat has a full 14 round top and is made up of a special combination of foam for stability and comfort.
[20″ min / 27″ max height]

Features:

• The Double Locking Clamp ensures your seat height stays consistent.
• Vise Lock Seat Clamp The Vise Lock Seat Clamp keeps the seat married to its legs.Special Foam Combination
• The Special Foam Combination provides superior stability and comfort.