Solo Vaporizer Glass Aroma Tube Straight has 4 air diffusion holes for smoother vaping. Made from Borosilicate glass, this is a replacement Solo Vaporizer Glass Aroma Tube from Arizer, the manufacture of the Solo Vaporizer. Always good to have extras in case one meets the ground hard. Tube Features: Compatible with Arizer Solo and Air Vaporizers 4 Air Diffusion Holes Made of Borosilicate Glass