We are often asked to supply the diameters of Goodwinds line. Due to the compressible nature of Dacron line, no diameter measurement is exact, but here is an approximation to help you in your purchase:
20#/10kg Dacron = approx.015"/.4mm dia
30#/15kg Dacron = approx.030"/.8mm dia
50#/25kg Dacron = approx.045"/1.1mm dia
80#/35kg Dacron = approx.050"/1.3 mm dia
100#/45kg Dacron = approx.055"/1.4mm dia
160#/75kg Dacron = approx.065"/1.7mm dia
200#/90kg Dacron = approx.085"/2.2mm dia
250#/110kg Dacron = approx.095"/2.4mm dia
300#/140kg Dacron = approx.100"/2.5mm dia
500#/230kg Dacron = approx.110"/2.8mm dia