Many stores and web sites sell office chairs and bar stools with a pneumatic riser tube to elevate the seat to preferred height. Manufactures often place a protective cap on the riser stem that fits into the seat bottom - during your assembly. As shown, this factory cap had a green label to warn us to remove the cap. (We used a magnifying glass to read the fine print and the graphic that appears confusing - if not redundant). So, we sent the manufacturer this photo of our suggested simpler, readable label. They should follow the KISS rule!