Pneumatic adjustment provides easy-touch height adjustment on this stool (with plastic base) by Drive Medical. The revolving 14" round seat is padded with 4" of comfortable thick black padding. It leads to a solid steel shaft and standard composite plastic base that doesn't skimp on strength and security, as evident in the 250 pound weight capacity. Of course, 5 casters allow easy mobility around the room. The product is protected by a limited lifetime warranty. Pneumatic adjustment provides easy-touch height adjustment from 19"-22.5"|Standard plastic base|Solid steel shaft|14" diameter round seat|4" thick padded seat (black)|Black, composite base|5 casters