Reddit reviews Green Goddess Supply - Reusable Glass Luer Lock Oil Syringe with Blunt Tip - Great for Refilling Cartridges - 2-Pack, 1mL Each

MAKES CARTRIDGE REFILLS EASY: This syringe injector makes replenishing oil pen cartridges a breeze! Each syringe in this set has a uniquely colored plunger to help you visually differentiate between varying oils.MEDICAL GRADE: The exteriors of these blunt-end syringes are made of out of borosilicate glass — the same kind of glass used to make lab equipment. Borosilicate glass enables great optical clarity, and is easy to clean and thermal shock resistant.DURABLE METAL PUMPS: The plungers in these syringes are constructed out of stainless steel, a metal with good resistance to corrosion, oxidation and heat. So you know how much liquid to release with the pump, measuring gradations are fused into the glass.PROTECTS AGAINST OIL AND LIQUID OXIDATION: This pair of mini refill syringes are affixed with 3 rubber O-ring seals each to ensure the injectors remain air-tight, so oils don't oxidize. A Luer Lock is also included to prevent accidental leakage.TRUST GREEN GODDESS SUPPLY: We work hard to develop quality products that will delight our customers and streamline their lives. We stand by everything we sell, so feel free to send back any purchase you are unhappy with within 30 days for a full refund.