This Boston Bruins Collectible Duncan Yo-Yo is perfect for string tricks and is designed with your favorite team's logo and colors. With practice, you can perform hundreds of tricks! You can tighten or loosen string-grip by twisting yo-yo body halves in opposite directions. This beginner level yo-yo has a team design on both sides. Beginner level. Team Design on both sides. Officially Licensed Product. | Boston Bruins Duncan Yo-Yo, N/a