It features a flared vacuum bowl, the bottom of the bowl measures 3mm, which has a near-perfect heat-retention capability, also perfect for cold starts at this thickness. The beveled edge top provides a nice sealing, and there are no weak points between the bucket and neck since it's full-blown, which greatly improves airflow and durability. The slurper measures 20mm ID, 15mm ID, 64mm total height, each piece paired with a 3-piece marble set ready to use, very convenient. Every product is function checked by our quality control department to ensure they come to our customers in perfect condition. High-quality quartz made, with 7 years of quartz bangers manufacture experience, support OEM and ODM, make samples for free, stable quality..syi