Detailed Product Description: Dental Series Polishing Brushes 1.Shank:2.35mm or 3/32 inch 2.Diameter of head:25.4mm,22mm,19mm,17.4mm,14.2mm,10.5mm and so on. 3.Shape:Plain,Six Star,Eight Angle,Bowl,Pencil 4.Material:Wool,Horsetail,Mix Wool,Soft Wool,Cotton,etc. 5.Especially:Curve Handpiece Pencil Brush,Curve Handpiece Bowl Brush