Sof-Lex Pop-On Starter Kit (Ref. 2380) Finishing & polishing discs for polishing of composite, compomer, metal and ceramic Flexible polishing discs with aluminium oxide coating Discs can be easily changed with the patented Pop-On mandrel system Contains: 120 x 3/8” & 120 x 1/2” Discs (Extra-Thin), Coarse, Medium, Fine and Super Fine & 1 RA Mandrel.