Custom 21x25" Matted Picture Frame with 17x21" Single Mat Image Opening Framed in 1.25" Black Stain on Solid Red Oak and choice of 2" 4-ply, pH Neutral White Core Mat. Comes with Economy Acrylic and a a wire hanging set for wall mounting! Made of Wood - this one of a kind custom picture frame will enhance any piece of art you put in it! This frame is made of Ash or Red Oak. Wood grains will show through finish.. This frame comes with one pH Neutral Mat with a White colored core. Fits 17x21" art or photos. Actual frame size (finished size) is 23x27". Actual glass size (inside size) is 21x25". This frame is 1.25" wide and 0.7500" high. It has a 0.25" lip (the part that covers the mat) and a 0.5000" rabbet (space between the lip and back of the frame).