ProtectStem Set contains 3 silicone Anti-Break Protection transport tubes for 70mm, 90mm and 110mm glass stems for Solo and Air Vaporizers. The ProtectStem Set includes the 3 lengths covering all existing glass stems for Solo and Air and each silicone protection tube is equipped with 2 caps which allow to completely protect the glass stems but also to be able to fill each stem in advance using the cap to close it.