jap matting pond media (Friday Bridge PE14)

i will take a picture, squares of jap matting pond media, it was in my filter but it's hard work and i replaced it with sponges, if any one would like the matting collection is pe140hu, it is approx 18 inch squares, like paving slabs, about 10, they slot into a filter side by side. I've put them in a container at the moment and forgot how many there are. i'll get specific if anyone wants them.