The Classic 4" Black Bird pie vent is made of oven-proof ceramic. It is an excellent gift for the pie maker or baker in your life. "Sing a song of six pence, a pocket full of rye, four and twenty blackbirds, bake in a pie. When the pie was open, the birds began to sing". This traditional pie funnel prevents the pie from boiling over and supports the pie crust at the center of the pie.