The caves measure approximately 1.25" wide by 1" tall by 4" deep, with a backing to create a dark spawning cave. Most hypancistrus plecos prefer a cramped cave that is slightly wider than the males pectoral fins, so please make sure these caves are an appropriate size for your fish before purchase. For bristlenose plecos, I also have spawning caves for them available on my store!

Please let me know if you have any questions!