These tunnels are a favorite for guinea pigs and have different fabric prints available. It provides a 3 way access tunnel for zooming through or just hiding for a nap! Tunnels are made from fleece fabric and contain a boning to help them stay open for your fur baby. Product Sizing 14" on the longest side and the hole openings are about a 6" diameter. Tunnels arrive flattened and require adjusting to proper tunnel shape before use.