The Dimensions of just the Troyer Tunnel is : (From Tip of Porch to back of Tunnel) 6-1-8". Porch area is 6" x 3". Inside depth 3". SuperGourds are not sold with tunnels. You can convert a SuperGourd and attach a Troyer Tunnel to a SuperGourd. The Troyer Tunnel is used on both the Troyer vertical and horizontal gourds.