From the etsy listing:
The miniature letters measure approx. 8 mm (0.31 inch) in height and 20 mm (0.78 inch) for the widest. The depth measures approx. 23 mm. The blocks have been cleaned to remove dust and dirt while making great effort to still retain their ink stains / patina. The composition have blocks which are with varying degree of usage. These may be from unused / rarely used to regular used and likewise have varying levels of wear & tear, ink staining & patina. All this adds up to the vintage appeal of these mini beauties. The images on square matrix is to give you an idea of size of the blocks. Each square measures 1 x 1 inch.
vintagemarvels on etsy