Rollerblader wheels: It's one of the best wheels on the market, very quiet and smooth, and doesn't scratch the floor. It normally costs about $30 for a set of five. Ergonomic :This saddle swivel stool is designed according to ergonomics, is very comfortable and can sit for a long time. Rotation & Adjustable Height: This saddle stool seat offers a 360-degree rotation and features an expansive adjustable height range, approximately from 21.5" to 28.5", allowing you to access the stool from various locations. Sturdy Base:The cast aluminum castor frame is light and very strong.Weight capacity: 350 lbs Super easy to assemble:Without any tools,you can assemble this stool in 3 minutes.