Yoyofriends launched the Graviton, Tony Sung's first signature yoyo, characterized by a sleek profile and titanium rings. Tony demonstrated tricks on Instagram, receiving positive feedback, but some fans desired a more budget-friendly version. After Tony's travels, where high prices deterred potential buyers, the Mono Graviton, an affordable alternative, was developed.

Tony, a yoyo designer using Fusion 360, envisioned a mono-metal Graviton early on. Testing revealed a preference for the power of the first prototype, prompting a slight weight increase in the final design. Despite praise, concerns arose that the initial prototype strayed too far from the original Graviton, leading to adjustments in the second prototype.

Named Graviton: Y, this version maintained the original's unique profile while enhancing smoothness and flow. Tony considered names like "Counter Graviton" but chose "Graviton: Y," signifying the second model. The more affordable Graviton: Y preserves the original's smoothness and acceleration. Tony encourages users to create lasting memories, emphasizing the personal connection with the yoyo in their hands.