I've got to get some braided stuff for my loom (i want it to look nice afterall ) but dunno how much to buy of what thicknesses i'm tempted to just buy 10m of each size

here's the options:
Ref. Bore. Fits. M. 100M
BS6B 6mm 5-7mm 72p £60.42
BS8B 8mm 6-9mm 80p £68.40
BS10B 10mm 8-12mm 94p £82.93
BS12B 12mm 10-14mm £1.13


also what other bits do i need if i want my loom braided, some sort of heatshrink stuff for he joins/ends?