NAILSOFTHEDAY Builder Gel 01 is a premium modeling gel, ideal for creating strong nail architecture and extensions on both upper and lower forms. With a maximum hardness rating of 5/5, it provides extreme durability, making it suitable for even extreme nail lengths without losing its shape or arch. The formula is crystal clear and engineered not to yellow during or after polymerization. Its medium-thick, self-leveling consistency allows for easy application and smooth modeling, while the reduced heat effect ensures a comfortable experience for the client during curing. This 30 ml size is perfect for high-traffic salons requiring efficiency and superior structural integrity.