I purchased this new and used it for a few months before storing it at home. The diameter is approximately 65cm when deflated. It's thick and comes with a pump (air pump). There is some slight discoloration, but it's not noticeable (see photos). Trideer Exercise Ball 65cm Thick, Heavy Duty, Supports 150KG, Anti-Burst, Non-Slip, with Foot Pump, Sports Balance Ball, Fitness Ball, Pilates Ball, Yoga Chair Thank you for looking.