Nails Inc Get Hard - Nail Hardener Treatment Give your nails a hardening health boost with this rebuilding base coat. Powered by naturally nourishing ingredients like biotin, kale, spinach and mushroom, it’s formulated to harden, protect and smoothen your nails in just one week. Added retinol builds up a chip-proof shield, locking in the hardening goodness, plus it’s the perfect way to get your mani greens! Depth: 26 MM Height: 121 MM Width: 58 MM Powered by retinol 94% harder nails