Feature: 1. Arithmetic Teaching: There are contacts on the surface of the dice, which is convenient for blind people to touch and perceive, so as to better learn and perform arithmetic. 2. Mellow And Safe: Smooth surface and mellow corner, will not hurt the delicate hands of the blind when used, can be used with confidence. 3. 100pcs Dice: With 100pcs dice with contacts, put the dice with contacts into the grooves board to use, simple operation, facilitate the teaching of arithmetic for the blind. 4. Compact And Portable: Light weight and in small size, suitable for different places such as home, schools for the blind, parks, etc. 5. Firm ABS Material: Arithmetic board adopts high quality ABS material, safe and eco friendly, stable and firm, sturdy and wear resistant, durable for long term use. Specification: Item Type: Arithmetic Board for Blind People Material: ABS Size: Approx. 20.8 x 26cm / 8.2 x 10.2in Characteristics: This product contains a board (16 x 20 grid) and 100pcs dice with contacts.. Package List: 1 x Arithmetic Board100 x Dice with Contacts Note: Please allow slight error due to manual measurement. Thanks for your understanding.