Made of high quality resin material, with flat and smooth surface and edges, and definitely safe to your fish.Suitable for small bream, cichlids when they need a rest or breed.This hideaway cave provides visual feast for you and a house for your fish.Allowed to stop in for a visit or a hideaway to rest or hide reducing stress and minimizing aggression like Cichlid, also a perfect place for Betta, Crayfish, or Crustaceans.Perfect for betta fish are also a decent and special piece for gift, like for girlfriend, boyfriend,best friend or especially for grand kids. It will be a great gift for your boys or girls if they have their own small fish tank.Model: 4 holesMaterial:Resincolour:GrayPackage Contents:1 * Fish tank decorationOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.