All caves are handmade by in the USA. The caves are made with all natural stoneware clays and fired to 2200+ degrees making them inert and 100% safe for your aquarium. Our caves will not leach anything, chemicals, into the water and will not breakdown.
Dimensions (will vary slightly):
Inside: 1.25" x 1.25"
Outside: 1.75" x 1.75"