These natural LDPE dropper tip plugs are ideal for the controlled dispensing of liquids. The controlled drop tips are available in 8mm, 13mm, and 15 mm sizes. The 8mm tips dispense 42 uL per drop, while the 13mm and 15mm tips dispense 40 uL per drop. Each tip dispenses one drop per second, which is ideal for low viscosity liquids. These controlled dropper tip plugs could possibly be used for dispensing water and alcohol-based products in various industries.