This bong tube from the 'Blaze Glass' Mix & Match (M&M) Series is made from 5mm thick borosilicate (Pyrex) glass & has a blue internal cooling spiral, a SG 45 standard grinding and comes with a silver ceramic transfer of the 'Blaze Glass' logo down the cylinder. The spiral in this tube, can be pre-cooled by filling with a liquid, eg: Vodka that won't solidify in a freezer, prior to use. Order No.: 'BC 45' - 'BongClip' ® Sure Grinding Clamp for SG 45