Dropper Capacity: About 0.34/0.68/1oz, Each size has 4 pcs, a set of 12pcs glass droppers in total. Select the required glass dropper according to different needs. Built to Last: Glass droppers are more convenient, clean, hygienic than plastic droppers, and they are disassemble, washable and reusable. Spiral tube glass dropper has better sealing performance. Wide Application: Glass droppers have wide application, can be applied to transfer various liquid, essential oil, fragrance, pigment etc. doing skincare, modulating perfume, making handmade beauty products, painting etc. Easy Use: Glass droppers can help us accurately retrieve the corresponding volume of liquid, making it easier for us to control while avoiding contact with other impurities, ensuring cleanliness and hygiene. Material Quality: Composed of black rubber head and high-quality transparent glass tube, the black rubber head prevents liquid backflow and the smooth glass inner wall facilitates liquid extraction.