The 8 1/2" diameter tray has a impressive capacity of 1 1/4 quart, and the seed is protected by a generous 12" diameter dome to protect the seed from the weather and discourage squirrels. Stainless steel and solid brass hardware lets you fully adjust the distance between the dome and tray. The tray and dome are molded of UV stabilized polycarbonate. Measures approximately 12 inches high.