Features: 1.The use of sand and stone material can make your aquarium fish tank outgas better. 2.It can be used as a decorative object to add a landscape to your fish tank. 3.This product can be cleaned and can be used repeatedly after cleaning. 4.There are two sizes, so you have more choices to meet your different needs. 5.Made of environmentally friendly materials, is durable and non?toxic, and can be used in various aquarium. Specification: Condition:100% Brand New _x000D_ Item Type: Aquarium Sand Bar_x000D_ Material: PVC, Sandstone_x000D_ Optional Size: Small Size, Large Size_x000D_ Small Size Length: Approx. 11.7cm/4.6in_x000D_ Large Size Length: Approx. 21.7cm/8.5in_x000D_ Instructions for Use:_x000D_ 1: Please soak this product in water for 15 minutes before use_x000D_ 2: Long-term use, if dirt clogged, air bubbles reduced, it can be taken out and washed repeatedly_x000D_ 3: It can be used with 2W and above air pumps (the larger the wattage of the air pump, the better the air output!)_x000D_ Product Function: Used in conjunction with air pump and air tube pump, more bubbles PackageList: 5 x_x000D_ _x000D_ AquariumSandBar