OYA Permanent Hair Colors include a comprehensive palette of 72 colors, with 11 intermixable series. all capable of lifting and darkening up to 4 levels. All colors are made with green tea extract and sea kelp to protect and restore hair. Impeccable lifting, up to 4 levels, 4 series, specifically designed to cover 100% gray hair, no intermixing needed. Also 5 concentrates that can be combined with any OYA formula.