Approximate size and weight of beads:

XS  -  dia 8 mm, weight of the strand 50 g

S  -  dia 10 mm, weight of the strand  70 g

M  -  dia 13 mm, weight of the strand 130 g

L  -  dia 17 mm, weight of the strand  200 g

XL  -  dia 21 mm, weight of the strand 400 g