Gaiam Classic Balance Ball Chair Leg Extenders (Only Compatible with Classic Chair & Classic Backless Chair) LEG EXTENDERS FOR CLASSIC BALANCE BALL CHAIR: Leg extenders add 2" of height to the Gaiam Classic Balance Ball Chair (only compatible with Classic Chair model) ADD 2 INCHES TO CHAIR HEIGHT: Extenders raise the suggested height limit from 5'11" to 6'1" PROPER POSTURE & ALIGNMENT: Helps taller individuals sit more comfortably and with proper posture and alignment EASY TO INSTALL: Leg Extenders are super easy to install with no tools necessary - just pop the extenders in to existing leg holes on classic frame SOLD AS A SET OF 4: Extenders are packaged in a set of 4 Remove the caster wheels from the base of the chair Insert the Leg Extenders into the holes making sure the metal connection point goes in the deepest hole and the two plastic connection parts go into the shallow holes Push the Leg Extenders firmly into the base until they are securely pressed up against the chair base Insert each of the 4 caster wheels into each of the Leg Extender holes Push the caster wheels firmly into the Leg Extenders until they are securely attached