This item is a set of soda bottle hatchery tools, made of plastic material, safe, durable and practical. You just need an empty soda bottle and air pump,then you will have a brine shrimp hatchery. Easy to install and use. Breeding tool for fish eggs in . Features -Color:Assorted Color -Material: Plastic -Size: 100.00X0.50X0.50cm/39.30X0.20X0.20in. - Air pump and soda bottle is not include in the package. - Install all accessories with air pump and soda bottles, add suitable , brine shrimp eggs into bottles, opened and brine shrimp outlet control closed, turn on your pump. - After the hatching of the brine shrimp eggs, stop the pumping and let stand for about 10 to 30 minutes. - The hatched shrimps will sink to the bottom and the shrimp shells will float up. - Close air flow control valve, open brine shrimp outlet control to collect brine shrimp. Package list: 2 x bottle lids 1 x 2M oxygen 2 valves 2 x control valves 2 x 3-way valves