Cobbles are natural stones whose edges have been rounded by erosion or by mechanical polishing. Cobbles are available starting from 56 mm. The smaller-format cobbles are exploited by way of wet or dry extraction and separated. The larger specimens, usually boulders, can weigh many tonnes.

Maas cobbles 90-130 mm
90 - 130mm
Beige - Brown
Maaskeien 90-130 mm los 2016
Rhein cobbles 100-300 mm
100 - 300mm
Beige - Brown - Yellow
Rijnkeien 100-X mm