5in1 Rubber Base: Meet the base gel, color gel, builder gel , nail strengthening, nail repair. Strengthen nails: Strengthen natural nails and nail tips. Make thin, brittle/fragile nails harder to break and roll. To smooth a dent or unevenness. Perfect foundation for your nails.Grow Natural nails: The thick texture makes natural nails hard and strong, not easy to warp, flake or crack. First choice for growing natural nails