Had when i worked in a preschool and kids love them! I would use colored sand instead of white salt. DIY salt tray with alphabet cards. Easy to make and kids have fun smoothing out the salt after correctly making the letter
My HIGH SCHOOL KIDS NEED THIS . Tip for helping kids manage their pencil grip. Have them hold a ball or cotton ball in their ring and pinky fingers. This forces these fingers to stay busy, while the pincer fingers hold the pencil!