Large Clear Glass Bubble are flat on one side and rounded on the other. 
Artwork put underneath it will become magnified. 
All glass bubbles will vary in size slightly. 
Glass bubbles are not completely smooth on the backside
a small faint line is visible on the back of some of the gems
due to the manufacturing process, however they are
very clear with very few bubbles.

The Large is approximately 1.5" Round and 3/8" thick.
Set of 4

Match the large glass bubble to our 1.5" glass to sandwich artwork between, wrap with copper foil tape and solder.