Useful Information - To work out the length of a given weight of Linen thread, take the Lea size/cord x 600 = m/kg
e.g. 25/3 x 600/4 = 1250m per 250g cop, or
e.g. 25/3 x 600/20 = 250m per 50g skein/spool
One lea is the size of a yarn spun to 300 yards from 1 pound of linen flax. A 10-lea linen would have 3,000 yards per pound etc.