Traditional finished walling block in mixed sized packsr r being a single block walling straight and curved walling can be easily builtr r each 520m2 pack contains 180 blocks in the following mix of sizesr r 20 no 150mm high 60 no 125mm high 72 no 100mm high 28 no 75mm high with random lengths of 200 225 250 275 300 and 325mmr r when using a 10mm joint each pack contains enough walling blocks to cover 520m2