Henrys Viper Yo-Yo with Book (Green) Henry's Viper Yo-Yo has proved to be one of the most popular and versatile string trick (1A) Yo-Yo's. It also offers great value The Viper is a butterfly shaped Yo-Yo with the wings made from tough rubber to provide durability and a good amount of weight Equipped with a silicone sticker response system and the "quick trick" adjustable gap this Yo-Yo is good for all levels of play The axle on this Yo-Yo is Henry's "speed explosion" high speed ball bearing axle that ensures long sleep times. The Yo-Yo comes complete with a book of tips and tricks