SIZE: 4 OZ - Single BarDermaHarmony 2% Pyrithione Zinc Shampoo Bar for dandruff and seborrheic dermatitis - Fragrance-Free - (4 Oz) Solid shampoos are great because they last a very long time, are less-expensive per wash, and produce less waste since they dont come in plastic bottles. Our soap-free 2% Pyrithione Zinc Shampoo Bar is derived from pla..