String Pocket MetalString Pocket invites creativity and personality where you can combine two or three String Pocket shelves into one larger shelf. Mix and match different colours to suit your style and preferences. String Pocket metal is sold as a complete shelf but is equally flexible as String System. The perforated metal shelves with low edge, 0. 7 inches, makes it possible to add hooks and rods (11. 8 inches and 22. 8 inches) to increase the storage possibilities.