This would depend on what you are painting as paint brushes come in various shapes and sizes. I would say for...
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Alphabet sheet: white BR lettering (1mm high)
Numeric/alphabet sheet: white BR numbering (6.67mm high)
Numeric/alphabet sheet: white BR numbering (6mm high)
Numeric/alphabet sheet: white BR numbering (1mm high)
Numeric/alphabet sheet: white BR lettering (6.67mm high)
Numeric/alphabet sheet: white BR lettering (6mm high)
Railtec All-0015 Alphabet sheet: white BR lettering (5mm high)
Railtec All-0006 Alphabet sheet: white BR lettering (2mm high)
Railtec All-0009 Alphabet sheet: white BR lettering (3mm high)
Railtec All-0012 Alphabet sheet: white BR lettering (4mm high)
Railtec All-0026 Numeric sheet: white BR numbering (2mm high)
Railtec All-0029 Numeric sheet: white BR numbering (3mm high)
Railtec All-0032 Numeric sheet: white BR numbering (4mm high)
Railtec All-0035 Numeric sheet: white BR numbering (5mm high)
Ultra Fine Brass Chain 0.5mmlink (40 links/inch)
Medium Chain 2.5mm Ring Link (12 links/inch)
Railway crossing with bell Mini sound effect
Small Tube Benders (5 Pieces)
Air Rescue Station Mini sound effect
Bell ringing Mini sound effect
Babbling Brook Mini sound effect
Rapunzel Mini Sound effect
Sheet styrene - .060" (1.5 mm) opaque white polystyrene V-groove siding
Knuckle Springs for 1700 & 1800 series Couplers (1 dz)
Twittering Birds Minisound effect
14 T SHAPE .141 3.6MM 3 PER
Z CHANNEL .250 2 PER PACK
14 T SHAPE .092 2.3MM 4 PACK
14 T SHAPE .073 1.85MM 4 PACK
14 T SHAPE .056 1.42MM 4 PACK
14 T SHAPE .035 0.88MM 4 PACK
Z CHANNEL .100 4 PER PACK
Z CHANNEL .180 3 PER PACK
Z CHANNEL .156 3 PER PACK
Z CHANNEL .125 3 PER PACK
Z CHANNEL .080 4 PER PACK
Z CHANNEL .060 4 PER PACK
14 T SHAPE .123 3 PACK
COLOUR SHEETS .010 RED 2s
14 T SHAPE .198 5.0MM 3 PER
BLACK SHEET 0.040 1s
COLOUR SHEETS .010 YELLOW 2s
COLOUR SHEETS .010 GREEN 2s
BLACK SHEET 0.080 1s
14 T SHAPE .257 6.5MM 2 PER
BLACK SHEET 0.060 1s