Joico K Pak Deep Penetrating Reconstructor. A powerful five-minute reconstructor that rebuilds and strengthens stressed, physically and/or chemically treated hair. Lost or depleted amino acids are replenished with a high concentration of Quadramine Complex for maximum reconstruction and protection from the cuticle to the cortex. With the use of Joico K-Pak Deep-Penetrating Reconstructor for Damaged Hair, weak and damaged hair is restored to its original strength and condition, helping to prevent colour loss and making your hair more responsive to styling.