The thickness of the board approximately 1 cm (interest is used a lot in copying and lip-boards or training for beginners put writing on the board and put a paper over it and heal them or walk your hand in case of training)
The thickness of the board approximately 1 cm (interest is used a lot in copying and lip-boards or training for beginners put writing on the board and put a paper over it and heal them or walk your hand in case of training)