Uni Air Filter Universal Foam for you to fabricate your own design! Sheet Size 12" X 16" X 3/8" - 60 PPI Black Fine Foam.Please see our Warranty & Returns Policy. Item Number: BF-4 Foam Piece: 16" x 12" and is 3/8 Inch Thick 60 PPI (pores per inch) Easy To Use: Place your existing filter on top of foam, trace it out, and then cut it out with scissors Made in U.S.A.