Our glass products are of stable quality with many years of smoking accessories manufacturing experience. There are 10mmOD and 12mmOD spiral rolling tip sizes for your selection, the tip measures 30mm in length. Made with quality borosilicate glass, it features 7 spiral intakes. Every product is checked by our QC team to ensure they come to our customers in good condition. Any broken goods received we offer a replacement. Working with global smoking paraphernalia brands for many years, we can custom all kinds of clear and colored downstems with your logo per your needs..syi