Product material： imported beech
Product size: 27CM (length) X15.5CM (width) X8CM (height)
Teaching aids composition:
Thick and thin tactile board A—a 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.