Hardcover cardboard book for kids 1)Board book,hardcover book 2)Customized design is welcome 3)Kids enlightenment 4)ISO14001 Product Name: Hardcover cardboard book for kids MaterialC1S art board: 250gsm, 300gsm,350gsm,400gsmArt paper: 128gsm, 157gsm, 180gsm, 200gsm, 250gsmIvory board: 210gsm, 230gsm, 250gsm, 300gsm, 350gsmKraft paper: 80gsm, 100gsm, 120gsm, 150gsmSpecial paper: 120gsm, 150gsm, ...