Personalized Extreme Triangle Youth T-Shirt. A percussion triangle with extreme triangle in rough text is a humorous music design. Fun gift design for musicians, teachers and students at back to school, birthdays and holidays. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.