it seems companies like drip tip designz, bully mods, justhatip etc have followed a progression in their manufacture. they must have thought the design is better. they all started with solid bare tru-stone and acrylic. next they ran a stainless tube through it with one o-rring at the end. probably in hopes that it does not melt. then there they put two O-rings on the stainless insert. I honestly feel the best flavor comes from bare plastics materials with one o-ring so it fits all atty's. I do not mind if an expensive tip eventually melts in lieu of flavor. however if they are thick enough they usually do not melt. I just feel taste is superior with no metal. I just got a huge one but it only fit's certain rba's. does anyone any longer make custom tips like what I am looking for? does anyone else agree pure plastics materials provide the best flavor or am I alone? I searched the web but can only find cheap Chinese stuff like that. the original ones were so much better imo. with the single o-ring right on the material. need small bore to fit kayfun,kanger etc. anyone know if anyoe is making these now and of custom quality?