6 Pack, 1/2" x 5.5/16" x 8', Primed MDF Shiplap, 1/4 Gap Style, Creates 3 Dimensional Effect That Is Modern & Elegant, Elongated Tongue Conceals Nail Heads For Fastening, Special Joint Allows Locking Between 2 Pieces, No Glue Needed. Covers 19.75 SQFT.