Hawk Nickel-plated Bb Slide Trombone. This beautiful slide Trombone in nickel-plated finish is ideal for the beginning student! The Trombone is a musical instrument in the brass family and has a cylindrical bore and a telescopic slide with which the player varies the length of the tube to change pitches. This Trombone is in the key of Bb. This trombone includes a durable case and mouthpiece. Type: Band and Orchestra