This is our 26" in diameter open tunnel. Made from heavy-duty material that is used for air ducts in mineshafts. The material is a scrim-vinyl coated and reinforced with steel rings. UV resistance and anti-microbial treatments have been added to insure longevity. Tunnel comes in 15' and 20' lengths and 4" pitch. Other pitches are available- CALL FOR INFORMATION Tunnel is very durable and with a thicker wire sewn into the fabric. Colors abailable are: Red, Blue Yellow and Green.