Roor has been making high quality glass in Germany for 20 years, so when you see the Roor logo you know it means quality. These wonderful Roor bowls are made of a thick glass thats not easily chipped or broken and offer a fantastic bowl size- enough for a party or a long session alone! These bowls feature a 18mm male end and showcase the Roor logo around the stem. Each order comes with your choice of a small, medium, or large glass bowl size. The perfect replacement or addition to your glass collection. We also carry the Roor 14mm glass bowl .