It's hard to think of Off String Yoyo (4A) without coming across the name of Rei Iwakura. Rei is a multi time 4A Yoyo World Champion who is equally as popular for his social media videos. Rei designed the contrail to be an accessible entry point for players to start their 4A journey. Light and fast, with predictable binds, the Contrail is suitable for player of all levels.