MatsMatsMats.com Rosin Box Our rosin box is a 1-foot square shallow wooden box with rounded edging all around for a user-friendly in and out. Low profile - won't tip over! Outside dimensions: approx. 14.5" x 14.5". Inside dimensions: approx. 12"x12". Weight: Approx. 1 lb. One half-pound bag of rosin fills the box.