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Refill for your FRTLZR Fret Polishing System: Fresh polishing sheets for the FRTLZR Fret Polishing System block, in both the Basic and Premium kits. Swap the grit and keep the tool. Full progression, 400 to 7000: 2 sheets each in 400, 800, 1500, 3000 and 7000 grit. That's 10 sheets, enough for two complete polishing runs from leveling marks to final shine. Start coarser when you need to: The 400 grit takes out file marks and deeper scratches after leveling and crowning. 800 removes oxidation. 1500, 3000 and 7000 bring the frets to a smooth, high-gloss finish that bends cleanly. German-made abrasive: The polishing grit is made in Germany for consistent cut and even results, sheet after sheet. For players, techs and luthiers: Keep a spare set in the case or on the bench, so a fret polish never waits on a reorder.