Introducing redken's acidic bonding concentrate 5 minute mask'. '.strtoupper('g')et bond repair for up to 3x stronger hair, hydration and strength repair after every use'. '.strtoupper('t')his intensely nourishing and hydrating mask is targeted at repairing hair from the deepest levels of damage and formulated with 16% citric acid, small enough to enter hair fibres and known to strengthen hair and conditioning care complex'. '.strtoupper('t')his innovative bonding mask contains a high concentration of conditioning oils and cationic agents, offering up to 72 hours of ultra hydration and 2x more shine'. '.strtoupper('t')his quick and easy to use hair mask is perfect for all hair types and textures, including colour treated hair without stripping hair colour'. '.strtoupper('t')o use use as a complete system with the acidic bonding concentrate shampoo'. '.strtoupper('a')fter shampooing, apply to wet hair from mid lengths to ends'. '.strtoupper('l')eave on for 5 minutes and rinse thoroughly'. '.strtoupper('u')se at least once per week or as often as needed.