No fading, safe and non-toxic, no impact on water level, safe to use. More natural colors can be added to the aquarium or decoration.< /p> Easy to clean, beautiful and generous Material: environmentally friendly resin Pineapple House 6.5cm x 6.5cm X 12.5cm Octopus house 6.5cm x 8cm x 14cm Castle King crab restaurant 8.5cm X 6cm X 8.5cm