This is Bockingford 198g watercolour paper. It's a bit too thin to use without being stretched as is has a tendency to cockle really bad. Even on the stretcher it's hard to stop it from cockling but at least it drys relatively flat.
I like to use this thinner paper for practising because the quality is good and it's economical to use. My only gripe is that the clips on these can be difficult to put into place if you have problems with your fingers and they also tend to catch any loose paint that runs off the edge of the paper which has to be mopped up regularly.
At least now I can have 3 pieces of paper stretching, and be ready to paint anytime!