MEASUREMENT AND SIZE: Each dropper is graduated as follows: 1 ml, 2 ml, 3 ml, 4 ml, 5 ml, with no smaller markings in between. Total length including silicone squeeze top is 4.72 inch (12cm). SAFE MATERIAL: 8 Pcs liquid droppers, each dropper is made of food grade silicone and plastic. FUNCTION: Mainly used to dispense liquid in minimal amounts to fill in small cavities for candies making, food decoration, essential oils, good choice for kids creative activities and fun science experiments. DETACHABLE: There is no glue used to connect silicone and plastic. Easy to remove the silicone by pulling and separating from the plastic pipette. EASY TO STORAGE: It is safe to put in dishwasher, oven, freezer and refrigerator.