What length of single-strand ø18 mm band to choose for your speargun
For a 75 cm SPF540 roller speargun: circular band ø16 mm, 44 cm long.
For a 90 cm SPF540 roller speargun: circular band ø16 mm, 52 cm long.
For a 100 cm SPF540 roller speargun: circular band ø16 mm, 56 cm long.