If you seek long-term cooperation and procurement, can leave a message to me,I can give you a set price and logistics solutions. Product introduction Model: 18 *180mm Diameter: 18mm Length: 180mm Material: BORO Glass We have 6*30mm,10*100mm,15*100mm,15*150mm,18*150mm,18*180mm,20*200mm,25*200mm,30*200mm Please visit our store and search it !!! Thanks for coming!!! Model: 18 *180mm Diameter: 18mm Length: 180mm Material: BORO Glass We have 6*30mm,10*100mm,15*100mm,15*150mm,18*150mm,18*180mm,20*200mm,25*200mm,30*200mm Please visit our store and search it !!! Thanks for coming!!! Product Picture Show