The Jim Dunlop glass slide comes in a variety of models.

 

J202 has a regular wall, medium, suits ring size 8.
Dimensions: 18mm x 22mm x 69mm 

J203 has a regular wall, large, suits ring size 12.5.
Dimensions: 22mm x 25mm x 69mm

J204 has a medium wall, short knuckle, suits ring size 10.5.
Dimensions: 20mm x 25mm  x 28mm

J210 has a medium wall, medium, suits ring size 10.5.
Dimensions: 20mm x 25mm x 60mm

J211 has a heavy wall, small, suits ring size 7. 
Dimensions: 17mm x 25mm x 69mm

J212 has a heavy wall, short, suits ring size 7. 
Dimensions: 17mm x 25mm x 51mm

J218 has a heavy wall, medium / short, suits ring size 10.5. 
Dimensions: 20mm x 29mm x 51mm

J215 has a heavy wall, medium, suits ring size 10.5.
Dimensions: 20mm x 29mm x 69mm

J213 has a heavy wall, large, suits ring size 13.5. 
Dimensions: 23mm x 32mm x 69mm

J234 has a heavy wall, medium flare, suits ring size 10.5. 
Dimensions: 20mm x 25mm x 69mm

J235 has a heavy wall, large flare, suits ring size 13.5. 
Dimensions: 23mm x 32mm x 69mm