Features: 1. Made of the environmental protection material PU.PVC.Resin which won't cause influence on on water quality. 2. Decorative fish tank is very realistic, it swings that follow water flows! 3. Easy to use, just directly placed it in the tank, the sand of planting fish tank. 4. It's appropriative for aquarium, it does not have any pollution and injury for aquarium creature. 5. Can provide a place for the attachment of nitrifying bacteria. Specification: Condition:100 percent Brand New Material: silicone Color: Yellow, White, Red(optional) Size: approx.11 x 7 x 8cm or 4.3 x 2.8 x 3.1in Weight: Approx.63g or 2.2oz Package list: 1 x Silicone Coral Note: 1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 3. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. 1,Made of the environmental protection material PU.PVC.Resin which won't cause influence on on water quality 2,Decorative fish tank is very realistic, it swings that follow water flows 3,Easy to use, just directly placed it in the tank, the sand of planting fish tank 4,It's appropriative for aquarium, it does not have any pollution and injury for aquarium creature 5,Can provide a place for the attachment of nitrifying bacteria Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.