hangyu hongda plastics industry co., ltd .It build in 2003. It is near hangzhou city. We are a leadermanufacturer in roll on line and in plastic ball line in china1.Our hollow ball size :9.5mm180mm2.Our solid ball size:1mm55mm3.Our plastic roll on bottle capacity:10ml,20ml,30ml, 40ml, 50ml,60ml, 75ml, 120ml,180ml4.Our glass roll on bottle capacity:25ml, 30ml, 45ml,50ml,75ml. Our plastic ball is used in three field:1.for cosmetic or pharmaceutical package2.for solid bearing ball, industry ball3.water floating ball, sewage disposal ball .Pls feel free to contact me if u are interested in our products.My name is henney huang