Children's puzzle touch panel $ 23.25 Product material imported beech Product size: 27CM (length) X15.5CM (width) X8CM (height) Teaching aids composition: Thick and thin tactile board Aa board with half of rough surface (sandpaper) and smooth surface (wood). Thickness touch panel B (the same thickness)-sandpaper cut into long strips arranged at intervals. Thickness touch panel C (different thickness)-sandpaper cut into long strips, arranged from thin to thick intervals. Thickness and thickness matching board-each of 10 boards with rough and smooth sides is divided into five levels according to the thickness, and two boards for each level.
