These are so unique, so wonderful! You get two cabs in this set, each measures 27x24mm and is made of opaque white glass. Each cab has been faceted on the sides and has a deeply concave bottom......you will need to fill the interior with glue if you are planning on gluing these to Lacys' Stiff Stuff. (I use cabs similar to these all the time, filling the interior with glue seems to be the best way to make sure that they are secure)