Hey hey, good morning all! @CuckFombustion My man, I have another shipment of those that should be shipping out very very soon, my guy is just waiting to add my WoodScents glass samples to the order then they in route. The glass used in all these pieces are very well made and is of high quality thicker construction. The silicone wrapped around the Resistube is an added layer of protection essentially is all, it does not serve a function in vapor production, only protection. I hope this is helpful and pls let me know if there is anything else I can do for you.