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Storex Wiggle Stool, Non-Slip Base, Adjustable 12-18 Inch Height, Blue - Featuring an adjustable seat height of 12-18" in 2" increments, these wiggle stools grow with your students and eliminate guesswork when ordering. An extra-thick padded seat allows for comfortable all-day use. The tamper-proof adjustable height reduces distractions and help promote a focused environment. The rubberized non-skid base is angled for improved posture and provides stablilty, even when over-tipped.