AT0066**. 26650 Kayfun V3.1 RBA Proprietary mouthpiece (NOT a 510 drip tip) Stainless steel construction Airflow control system Removable PMMA ring 28mm external diameter 510 threaded connector with adjustable center pin Height(without 510 connector and mouthpiece): 60mm Material: Stainless Steel (minor parts may be made in non-SS) + PMMA Price: $9.50 Unit: Each Quantity: