These refill pages are 6-hole-punched and they are designed to fit into system binders. The refill pages come in a wide variety of options, featuring Tomoe River Paper and Raymay\’s Bamboo paper. The wide selection of formats is designed for users to find their perfect system binder combination. Size: 76mm x 126mm 6 hole-punched Paper: Tomoe River or Bamboo paper 10sheetsincluded in \”Address\” and \”ID and Password Memo\” packs 30 sheetsincluded in \”Checklist\” pack Raymay Bamboo Paper:Bamboo paper refill is an innovative paper using 100% domestic bamboo. The paper is thicker than regular Raymay planner paper at 100g/m2. The bamboo paper exhibits an intermediate strength between hardwood and softwood, providing robustness and durability. Its uncoated surface offers a tactile, comfortable writing experience, with a natural color compatible with any ink. It\’s perfect for erasable pens, ensuring a smooth, firm writing and erasing experience without paper damage. About Raymay Fujii: Founded in 1890, Raymay Fujii is a Japanese company that manufactures and sells a wide range of products from stationery and paper to office machines. Raymay Fujii is one of the leading stationery manufacturers in Japan, and some of their most well-known stationery includes leather system binders, rulers, and compasses.