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Are molded from pliable rubber in two kidney shapes. They are used for smoothing, shaping and finishing pieces. The blue are very flexable, and the black colored rib are a bit more rigid.
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 |  Soft Finish Rubber  Soft, 3 1/8".

|  | FRSO Soft, 4 1/4".

|  | FRSM Hard, 3 1/8".

|  | FRH Hard, 4 1/4".

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