In choosing the SUN-FLEX Active learning stool, you're making a clear statement about your long-term health, well-being and comfort. SUN-FLEX wiggle stool puts more energy, movement and health in your office life. You can rock, swivel, lean, move & burn calories while sitting, which will help reduce the risk of office syndrome, i.e., neck pain, back pain and obesity, while enhancing your comfort at work. Round and frameless seat with 1.57inch premium molded foam cushion coating with upholstery fabric provides greater comfort when sitting. The sturdy pneumatic gas spring extends far enough to allows users of different heights to wobble and benefit from movement while sitting still. Light weight design with for easy mobility and storage, integrated handles for easy carrying to move around. Rubberized, non-slip base for increased stability, even when over-tipped, base is curved shaped for a wide range of motion. This task stool works great with a regular desk, standing desk and standing-desk converter in home office, studio, workshop, warehouse and garage as well as school. SUN-FLEX flexible seating will be a natural part of your workplace for years to come, and we promise that you will feel the difference. SPECIFICATIONS: · Adjustability: Height adjustable from 24.5 inch to 27.9 inch · Anti-slip surface: Grooved natural rubber backing · Materials: Upholstery fabric, steel, ABS plastic · Fabric durability: 110,000 cycles (Martindale) · Color: White frame, black seat, chrome gas spring · Maximum load: 264 lbs. · Dimension of seat: Ø 12.2 inch · Dimension of base: Ø 11.4 inch