... area,making tension test Tension force:custom. Item nameTennis ball with elastic string and computer stringMaterialPolyster/LatexDiameter0.45mm-0.5mm ColorBlack (we can ... Use Garment,tags,elastic ribbon. clothing, pants, hats, gloves, socks, fabric & other reflexible products etc. .MOQ300000meters(welcome your quantity)Sample time3 ...