Class Cylinders (also known as 'Glass Globe's). These are heavy glass cylinders typically used for outdoor
lanterns as shown above. We've found them useful in making Cloud
Chambers and other scientific applications. If you have an application
or they look useful to you, we have dozens of these if you need 'em. Cylinder measures 4 1/4" OD x 4 5/8" H. Inner diameter is just over 4".