Trombone Rocks Funny Musical Instrument T-Shirt Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 50% Cotton, 50% Polyester Imported Machine wash cold with like colors, dry low heat Trombone rocks with three dancing horn playing rocks is a humorous horn gift design for low brass musicians, music teachers and school students in concert, jazz and marching band. Design copyright Karen A Barthol. Lightweight, Classic fit, Double-needle sleeve and bottom hem