CanDo® Exercise Ball, 22 Inch Diameter, 1 Each Feeding Supplies MJM's Exclusive Reinforced Caster System Procedure Mask Ultra Pleated MJM's Exclusive Reinforced Caster System Allows Additional Structural Support To Our Entire Product Line Our Positive Engaging Lock Holds The Wheel Securely So There Is No Swivel Movement When Locked * The Unique Design Allows Easy Movement On Hard Surfaces And Helps Eliminate the Wheel From Falling Into Cracks * Soft Non Marking Tread * (It Will Not Leave Black Marks Or Leave Groves In Wood Or Vinyl) * Quite Mobility * (Hard Treads Make A Lot Of Noise) Non Rust Plastic Body And Wheels * High Load Capacity (160 lbs) Adult Cuff 10 16 * Fits almost all aneroid and mercurial blood pressure units (not digital) * Does not include the bulb and valve * Suggest #1 1890 * 300 lb weight capacity These deluxe inflatable balls are made with a vinyl that is specially formulated to release air slowly if a sharp object like a pen or pencil accidentally punctures the ball