JK/4 and JK/8 also produce unbleached sulphate papers with secondary fibre content. On JK/4, this is machine finished EKOSTAR paper produced in weights of 35-110 g/m2, while JK/8 produces machine glazed Imikraft in weights of 35-90 g/m2. Imikraft can also be manufactured in ribbed variation. These types of papers look similar to unbleached sulphate paper. The papers are most often used for the production of bags or as packaging material.