Yamaha Custom Series Large Shank SL-51C4LGP Rim Diameter: 25.23mm Throat Diameter: 6.92 Retail Price: ¥18,150 Purchased about 12 years ago and stored for a long time. It has been carefully stored, but I am selling it to organize my belongings. There are scratches on the outside, and some discoloration of the plating due to long-term storage can be seen, but there are no problems with use. Product Description: Has a slightly shallower cup than the 51, allowing for powerful playing at high volumes. With a rich sound across the entire range, it is suitable for symphony orchestra players.