We need Boron treated kiln dried (moisture contents less than 12%) rubber wood for our brush blocks.You can supply as S2S, S4S or finished brush blocks.Our Sizes are normallyLength : 300 mm, 400 mm, 500mm, 600mm, 900 mmwidh : from 55mm to 90mmThickness : from 20 mm to 50 mmThere are so many sizes of blocks within this rangePlease quote your lowest price Thanks