There are a couple of gauges smaller than N gauge, the most recognised being Z and T gauges.To give you an idea...
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2063 - Micro Finishing Cloth Abrasive Refill - 3200 Grit
351 - Ultra Fine Waterproof Finishing Pack
2064 - Micro Finishing Cloth Abrasive Refill - 3600 Grit
2065 - Micro Finishing Cloth Abrasive Refill - 4000 Grit
2066 - Micro Finishing Cloth Abrasive Refill - 6000 Grit
2067 - Micro Finishing Cloth Abrasive Refill - 8000 Grit
2068 - Micro Finishing Cloth Abrasive Refill - 12000 Grit
348 - Double Coated Micro Finishing Film
3200 - Flex Pad Single - Fine 320 grit
321 - Grit Tape - Selection Pack 150, 280, 320 & 600 Grit
M930004 - Magic Brushes - 18 x Teal Large & 1 Applicator Handle
CS320 - Cone Tip Sander - 10 x 320 Grit Pieces & 1 Applicator Handle
CS321 - Cone Tip Sander - 15 x Assorted Grit Pieces & 1 Applicator Handle
CS400 - Cone Tip Sander - 10 x 400 Grit Pieces & 1 Applicator Handle
CS600 - Cone Tip Sander - 10 x 600 Grit Pieces & 1 Applicator Handle
M929005 - Magic Brushes - 18 x Yellow Medium & 1 Applicator Handle
M929007 - Magic Brushes - 18 x Red Extra Fine & 1 Applicator Handle
M930001 - Magic Brushes - 18 x White Fine & 1 Applicator Handle
M933001 - Magic Brushes - 18 x Blue Brush & 1 Applicator Handle
CS150 - Cone Tip Sander - 10 x 150 Grit Pieces & 1 Applicator Handle
MB05 - Magic Brushes - 15 x Assorted Brushes & 1 Applicator Handle
N930005 - Nano Brushes - 24 x Blue Large Tip & 1 Applicator Handle
N934001 - Nano Brushes - 24 x Green Short Tip & 1 Applicator Handle
N934002 - Nano Brushes - 24 x Black Long Tip & 1 Applicator Handle
N935004 - Nano Brushes - 24 x Teal Medium Tip & 1 Applicator Handle
N938001 - Nano Brushes - 24 x Green Knife Tip & 1 Applicator Handle
NB06 - Nano Brushes - 24 x Assorted Tips & 1 Applicator Handle
Your Guide to Modelling Dutch Railway
Let's Go Railway Modelling
CS280 - Cone Tip Sander - 10 x 280 Grit Pieces & 1 Applicator Handle
N935003 - Nano Brushes - 24 x Light Blue Small Tip & 1 Applicator Handle
550 - Flex Set Complete Finishing Kit
3211 - Micro Finishing Cloth Tape Refill - Assorted Grits
322 - Grit Tape - Selection Pack 400, 600, 1000 & 1500 Grit
3600 - Micro Finishing Cloth Tape Refill - 3600 Grit
400 - Grit Tape - Fine 400 Grit
4000 - Flex Pad Single - Fine 400 grit
4000-1 - Micro Finishing Cloth Tape Refill - 4000 Grit
535 Flex-Pad Ultra-Fine Intro Set
5555 - The CA-ndle Holder & Replacement Tips