The Fish Tank Overflow Comb is made of sturdy and safe material. The overflow design effectively prevents fish overflow. It can be placed in different connected aquariums as a fish . It has high transparency, easy to clean, and harmless to fish and corals. Features -Color:Black -Material:Acrylic -Size:20.00X5.00X0.30cm/7.86X1.97X0.12in -Size:10.00X5.00X0.30cm/3.93X1.97X0.12in - Crafted from durable and practical acrylic material, this overflow box comb is a must-have any aquarium enthusiast. - The innovative design prevents any fish or water plant overflowing from the fish tank. - It is incredibly easy and convenient to use, ensuring that your fish and gravel remain safe and secure. - The simple and removable design makes it easy to clean and maintain. - This accessory is perfectly suited for use with an overflow box, and it helps to spread the water evenly throughout your aquarium. Package list: 2 tank comb(10cm) 2 tank comb(20cm)