Available Natural wood Natural wood block Curly birch 36001 €11.00 Natural wood block Curly birch. Peculiar natural wood block of Curly Birch, Betula pendula var. Carelica, the beautiful and characteristic of this sort of timber is the pattern which it shows due to a disease or genetic mutation, this causes the tree to twist on the stem and the annual rings are oriented incorrectly, which gives the wood that weird... Add to cart