you can build it with CritterTrail fun-nels

Has a squeaker inside

Heavy Duty Attachment Spring

FD&C Red #40 and FD&C Blue #1)

Resealable Bag

River Jack Aquarium Gravel - Non-Toxic, Colorfast, Vibrant Substrate for Aquariums, Terrariums, Ponds & Crafts Reptile & Amphibian Medication Product you can build it withNatural River Jack Aesthetic: Smooth, naturally colored stones create a rustic, riverbed inspired look, enhancing aquariums, terrariums, and decorative setups. Non Toxic & Safe: Made with a 100% acrylic coating, this gravel is non toxic, colorfast, and will not alter water chemistry, ensuring a safe habitat for aquatic life. Versatile for Various Uses: Ideal for freshwater and saltwater aquariums, terrariums, ponds, potted plants, vases, and craft