Echo park paper-photo freedom 4 by 6 and 3 by 4 photo sleeves contain ten 12 by 12 photo sleeves with four 4 by 6 horizonal pockets and four 3 by 4 vertical pockets. this product coordinates perfectly with other products in the photo freedom system. the photo freedom system can be used alone or works well with other tools and embellishments you choose to add. acid and lignin free.