The black one is around 33% and it is covered with 21st Cent Coverite-- However I am getting ready to recover it with Sig Koverall and dope. The black is for "sunny day" flying only and even then it gets very vague in the sky. The red one is Monokoate. I have talked to a local buddy that also havs the MR Weeks and is starting to build the same size SI and he says the biggest difference is that the SI is 6" shorter in the fuse. I did not know that SI made the larger size.