These beautiful wooden sand tray sets come complete with 1 lb. of sand and a chalkboard lid is perfect for letter-writing practice. Three plastic sheets in red, yellow and blue can be inserted inside the tray under a clear acrylic base; Place the tray on top of a light table for color mixing and to enrich the child's experience when learning to write letters; Tray size: 8.85 inches x 8.85 inches x 2.55 inches; 1lb. of Sandtastik sand included in each set; Tray can hold lid straight for teachers to write letters on chalkboard; Extra clear plastic sheet provided to place on top of acrylic tray base for extra acrylic protection when sand is placed inside tray; alphabet sand tray sand tray prewriting prewriting sand tray abc writing sand chalk board light table light panel writing letters alphabet alphabet sand tray sand tray prewriting prewriting sand tray abc writing sand chalk board light table light panel writing letters alphabet