CUSTOMER SERVICE: Any problem, please contact us directly, we offer to replace or refund service. Our product is brand new and sealed well. If the item you got is not new or damaged, defective or missing items, please feel free to turn to us for help. Please note: take a skin test for 24 hours before use. If discomfort or allergy occurs, please stop using it immediately. SAFE & HEALTHY: Modelones led hard gel builder features healthy and 11 toxin-free ingredients. No harsh ingredients or adhesives that lead to damaged nails, anti-chipping, low odor and skin-friendly. 30 DAYS NO PEEL-OFF & BUBBLE FREE: Modelones gel builder is made of professional formula, which is adjusted after 72 tests. Say Goodbye to Air-bubble and Peel-off problems. High durability gel builder can stay last longer and brings you natural, strong, flexible, and feather-light nails. Long-lasting for 28+ days with with proper application. QUICK & EASY APPLIACTION: High self-leveling formula along with built-in brush makes it easy to spread, help you create length, thickness or add strength to the nail you want, and ensure a smooth and natural nail foundation layer with perfect shine. (Need to be cured under UV/LED lamp for 60-90s). UPGRADED 8-in-ONE BUILDER NAIL GEL : Designed with innovative formula, this versatile builder nail gel is perfect for 8 amazing applications including as a base coat, color gel, building apex, strengthening overlay, extending length, shaping nail, and to attach false nail tips / gems / jewels.