Yamaha Model 51B The 51 rim with a relatively shallow cup.

Powerful sound.

Similar to a Bach 5G, but with a shallower cup - or a Schilke 51B.

Inner Diameter = 25.23mm.

Contour = standard.

Thickness = standard.

Cut Depth = semi-shallow.

Throat = 6.92mm.

Backbone = semi-wide.