Movable Letters are a traditional Montessori item used to spell words. Many Spelling/Phonics programs now use a similar version including our curriculum All About Spelling. All About Spelling sells a nice one that includes the blends, diphthongs, etc. I made my own to use with the All About Spelling program and to use with my word cards for ABC of the Quran for Lil A. You are more than welcome to download them here. Most craft magnet strips come with an adhesive back and I have found them to be under $2.00. I cut the magnet to the size I need and stick them on. Putting them on a magnet board is so much easier than storing them in a sectioned craft or tackle box.