They're great heads. Normally I really dislike Evans heads, but these are great. I ended up buying a set of them for the toms on my walnut stave kit, paired with a Remo Renaissance on the bass drum.varatrodder mentioned the 10 mil single ply Evans Strata 1000. I'm using that and the 7.5 mil single ply Strata 700. These are orchestral takes on replicating calfskin heads. I don't need gel or tape with either.