Writing trays are a fun way to help kids work on handwriting, letter formation, and pre-writing skills. There are so many benefits to a sand tray (or other sensory writing materials) in helping with letter formation and handwriting. They encourage fine motor skills and an introduction to handwriting; They use a tactile sensory strategy to encourage movement in learning in a multi-sensory way. Writing Trays make letter formation fun and meaningful in a play-based manner.