This a real smooth slide. I've always used the Pyrex type and not a fan of brass. This is polished porcelain like the bathroom sink. The hole large enough for my big shovel fingers.
I like to messed around in open tuning slide once in awhile. This came with a little open tuning slide guide, some tips, and I thought that was a nice little feature. Plus, I'm a big fan of Billy Gibbons.