King 3B silversonic trombone H. The horn is in fantastic condition. There are a few small mute dings on the bell and some wear on the hand grip, shown in the picture. The slide is a 9.5/10 and was recently serviced by the slide doctor. The item "King 3B silversonic trombone H. White" is in sale since Friday, January 15, 2021. This item is in the category "Musical Instruments & Gear\Brass\Trombones". The seller is "perk3661" and is located in Ellicott City, Maryland.