If a product has Roor logo you know its quality. For over 20 years they have been the leader in high end, high quality glass and theyre accessories are no different. These downstems are made of a high quality Schott-Duran glass, that is extremely heat and scratch resistant. The ends are open to allow maximum air and smoke flow. Each downstem comes in your choice of sizes for Straight neck pieces (7.25″ long) or Beakers (8.25″ long) and fits 18mm male bowls. These glass pieces are handmade to order, please allow 3-6 weeks for delivery. Need something smaller? Check out Roors 14mm downstem.