Our 9-piece, all-inclusive, felt bob kit is includes hard density felt bobs with 1/8" shafts designed for your portable hand tools and portable grinders. Kit contains the following: 1 each: 1/2 x 3/8 x 1/8 Cylinder; 1/2 x 1/2 x 1/8" Cylinder; 1/2 x1x 1/8 Cylinder; 1/2 x 1 x 1/8 Cone; 1/2 x 1/2 x 1/8 Mushroom; 1/2 x 1/2 x 1/8 Mushroom; 1/2 x 1 x 1/8 Tree; 1/2 x 1/2 x 1/8 Ball; 1/2 x 3/4 x1/8 Mushroom; and 1/2 x 3/4 x 1/8 Cone.