Clear dome protects against the weather and won't hide the birds. 11 inch diameter cage keeps out gray squirrels as well as Starlings, Grackles and other large birds, while the wire bottom prevents hulls from accumulating. The cage attaches with a black nylon wing nut (included), making it easy to remove for cleaning. Stainless Steel wire - long lasting and chew-proof Spring clamp - holds dome securely against cage 1 1/2" openings - let songbirds in, keep pesky gray squirrels out UV Stabilized Polycarbonate tube - for longevity