Flattop plywood case, black vinyl covering, padded plush interior with accessory pocket. Fits Martin basses with J-size bodies, BCPA4 (current), B1, BC15E, BC16GTE (discontinued models). Approximate dimensions are 50" long, 5" deep, 12" wide at upper bout, 16" wide at lower bout, body length 21". As with all cases, padding will compress for somewhat larger guitar measurements.