dAndrea 202 Glass Slide Double

I find that the larger slide is a good fit for my for my ring finger and I use it for clean rhythm sections as the glass gives more clarity than metal, but it is far from my main slide.
The smaller of the two is a good size for the bottom knuckle of my ring finger, but it is a bit short and so gets caught when moving between strings.
Personally its not really for me but I'm sure that some people would like them depending on what you need.

The dAndrea glass slides feel smooth and sound clear, but I personally prefer the brighter, more metallic tone of metal slides. Still, these are good quality and comfortable to play with.