45 Slate pencils in one small carton box, cut from natural stone Length 85mm approximately. 8*6 mm thick approximately. Size may differ slightly, pencil to pencil, finish and proportion Writes smoothly on black boards, Slate, art ,office, home and earthy to taste This Slate Chalk Pencil is made of Natural Limestone. It is Perfect for writing on any slate chalk board. Soft slate pencils are made from natural stone. Slate pencils are used to write with on slate and chalkboards.