... 1.size of 30x40,40x60cm,60x90cm and 90x120cm 2. nature wooden frame 3.material: MDF blackboard with size of 30x40,40x60cm ... ,60x90cm and 90x120cm, we can also make cork board, and white board etc, the quality is super and price is competitive ... $4.5060x80cm1.8x2.0cm$8.2060x90cm1.8x2.0cm$9.50 chalk board