This is a Willie's Monster VSDP mouthpiece for bass trombone. The size is VSDP, with an inner rim diameter of 28.8mm and a throat size of 8.1mm. After purchasing it new, I had it gold-plated with ferric gold. I only tried it a few times after purchasing it, but there are some black spots, possibly due to the plating deteriorating. There are scratches on the shank from use, but no other damage. The original box is also included. I am not considering any further price reductions at this time.