You could PM the poster and ask. It looks pretty simple to me though.
I think those are 4 X 4 coasters, covered. On the inside cover, sandwich a piece of ribbon bewteen the coaster and patterned paper to use as a closure. Then cut 3 pieces of cardstock to 4X 6 and score at 4 inches. Fold it up and tape the sides up (red line tape would be best). Then, decorate with patterned paper. Using a bind it all, punch pages and then bind.
All those measurements are assuming that those are 4 X 4 coasters though, so it may not be exact.
It should be close enough to replicate the project though.
If you don't have a bind it all, you could always use a hole punch and large eyelets of even just reinforce the holes with additional cardstock circle punches.
HTH