The comfortable rolling swivel stool features a thick cushioned seat with a mechanism (seat plate) screwed which can rotate 360-degree freely, equipped with a sturdy hydraulic gas lift cylinder to adjust height(height range 8”), a heavy duty 5-legged metal chrome base with durable rollerblade wheel casters which can roll smoothly and swivel 360-degree .The hard-working stool chair makes it easier to get through a busy day, very convenient for multi-tasking work. The contemporary style is applicable to home and workplaces. <br> <br> <b>Specifications:</b><br>Stool chair size: <br> 21 x 13.5 x 22 inches (base diameter with wheel x seat diameter x minimum height) <br> 21 x 13.5 x 30 inches (base diameter with wheel x seat diameter x maximum height) <br> Height range 8 inches! <br> Seat: cushioned measures 13.5 x 3 inches (diameter x thickness) <br> Upholstery: high quality thickened PVC leather <br> Cushion: brand new high-density sponge <br> Base: Heavy duty reinforced aluminum base measures 19 inches diameter <br> Caster Wheels: 2.5” diameter size durable polyurethane <br> Weight capacity: 400 lbs <br> Warranty: 1 Year <br> <br>  <b>Caution: </b><br>Remove the plastic cap on the top of the gas lift before assembly! This is a part of packaging only!<br><br><b> Customer service:</b><br> Please contact Shenzhen Karrie for any issues.Customer service and technique support can be provided. We welcome and appreciate customer's valuable suggestion too.