Size: 14" x 5" Material: Steel Thickness: 1.5mm *There may be some error due to measurement with an analog caliper. This is a Yamaha snare drum shell only. I believe it is a Yamaha SD-5, but I am not confident about the model number. It appears to be a 70s badge. The distance between the lug mounting screw holes is 48mm center to center. As you can see, it is chrome-plated. The inside is dirty, but there is almost no rust, and the condition is very good. It's a good quality shell made in Japan. I was planning to assemble it someday, but I don't seem to have the time, so I'm letting it go.