PK Green Set of 3 Letter Openers with Bookmark and Ruler - Green Set of 3 PK Green letter openers with ruler and bookmark Sleek design. Durable plastic construction: no danger of metal blade 5-inch ruler on each letter opener. Built-in clip: handy for use as a bookmark Magnet on the back: can even stick on the fridge or wherever you wish Length: 17cm, maximum width: 3.5cm