Bellitas Strictly Professional Eyelash Tint Developer has 3% 10 volume peroxide to be used in conjunction with Strictly Professional Eyelash Tints. Therapists need confidence and assurance when using products on and around the delicate eye area. The Strictly Professional eye range provides just that guarantee with its professional formulated products. The Strictly Professional range continues to evolve and provide cost effective beauty solutions for the spa, salon and college. Directions: Mix Eyelash Tint with Eyelash Tint Developer, before applying mixture to brows and eyelashes.