Brand: PGM Item No.: JZQ001 Name: Mr. Triangle Posture Corrector Material: PVC Weight: NW/GW: 0.1kg/0.16kg product description 1. High quality PVC material, feel comfortable 2. Set arm distance and correct swing trajectory can reduce the generation of left and right curve balls Tip: There is a plastic sheet at the air hole to prevent air leakage. You need to flatten the air blow hole when blowing air, and do the same when deflating.