Vibram Ball Feet

Get a more stable seat with this set of 4 ball feet made from VIBRAM rubber. 

45mm: Compatible with Chair One, Chair One L, Chair Two, Chair One Mini, Speed Stool, and Chair Zero 

55mm: Compatible with Chair One (re), Chair One High-Back (re), Chair One XL, Swivel Chair, Sunset Chair, Savanna Chair, and Bench One.