Awesome Bass Guitar Heartbeat T-shirt - Men | Women 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 Cool electrocardiogram ECG heartbeat/lifeline T-shirt perfect gift for the budding or experienced bassists/guitarists. Bassist, band tees, bass player, guitarists, musician this tee would be perfect for all of these. Lightweight, Classic fit, Double-needle sleeve and bottom hem