Herlitz 1913672 Ring Binder A4 PP 4-ring, 24 mm Pack 3 Pack (Assorted Colors) (Office supplies & stationery)
Good clean workmanship, good price-performance. Have the books for my grades. Are so used every day. Also, the beautiful colors, so you can classify documents / papers. All the best, expectant me soon have to order yet what :)