21mm by 3mm strips of soft wood. The wood was bought from Daiso, a $2 Japanese store in Singapore. For that you get 3 strips. Each strip has been stained 4 times with Indian Rosewood stainer and brushed with 6 coats of clear gloss varnish. Long job. Next time I will go for a darker stain and choose the best side of the wood. Mind you, I suspect that the real boards were originally quite rough.