28.4 g box of Rit Whitener & Brightener. Works with your detergent to whiten your whites and brighten your colors so that you can enjoy your clothing for the long run. Can be used with any washing machine, including high-efficiency machines. Perfect For: Cotton, Linen, Silk, Wool, Rayon, Ramie, Nylon, Viscose, Modal, Tulle, Hemp.