It is a good slide but I'm a.bit disappointed that this thing is very small. My hands are not small but not large, I'm not even 6" tall.
I have a Dunlop glass slide that is quoted to have the same internal diameter and fits my finger. But the mud slide does not fit my ring finger. I guess you can play with the little finger, but this slide is a bit cumbersome to play with the small.finger as it is on the heavy side.
I much prefer the Dunlop blues bottle