The Eleiko Prestera Gliding J-Cups safely hold the barbell between sets. Once installed, they remain attached to the uprights for easy, smooth height adjustments and no loose parts on the gym floor. Designed for long-term barbell protection, the j-cups are made from durable bent steel lined with a plastic coating and feature polyurethane rollers to protect the bar knurling and support positioning adjustments. The Gliding J-Cups can be easily positioned at any height on the upright. These J-Cups are designed exclusively for the Eleiko Prestera series and are sold in pairs.