... cosmetic package,industrial ,track ball,and so on plastic roll on bottle 50ml,75ml PP,HDPE,PE ... package 1) We are specialize in producing plastic balls. Hollow plastic ball diameter10mm100mm, are mainly used in the ... mainly used in the industry of bearing.2) Plastic balls are made of different materials, such as ... so on. The tolerance can be 0.01mm with good surface and precision.3) Our products are mainly ...