n 2010 Henny Grijsen approached Jeroen Marseille and asked him to design a new catalogue of tree grids. In the end, based on esthetics, feasibility and expected sales, thirteen variations from the series were selected. These were developed and finally included in the Grijsen catalogue .
The grids are made from 10mm thick nodular cast iron. Even before publication of the catalogue, there was a demand for this new line of grids which are now applied throughout the country.