According to Colinette’s homepage the roving is 100g (June 2012)

From the Colinette website:

“Our rovings are made from 100% merino fibre at 23.5 microns and are just great for all types of felting and spinning projects. Each length is approx 140g in weight and hand dyed to our stunning range of shades. So time to roll up your sleeves and get stuck in – no double sided sticky tape needed here though.”