Bubbles begin as clusters of carbon dioxide molecules that grow from fixed spots on the inside of the glass. These fixed spots, or "nucleation sites," can actually be created through controlled breaks in the smoothness and texture in the bottom of the glass. Cutting edge laser technology allows us to create these sites, while adding a fun “bubbles" design inside the glass. Most logos can be replicated in this process. All glasses with nucleation sites are dishwasher and food safe.