Are made of polymer plastics,with the features of antibend,anti-shock,smooth surface,bright color and clear wire casing etc. Name: Para: Are made of polymer plastics,with the features of antibend,anti-shock,smooth surface,bright color and clear wire casing etc.With different surface finishing forms. Name:Roving Bobbin Para:Are made of polymer plastics,with the features of antibend,anti-shock, ...