Made in the USA Our entire product line is manufactured and assemble in the USA. Invisible Structures, Inc., has been in the stormwater management business since 1982 with our Permeable Paver systems Grasspave2 and Gravelpave2, ring and grid structures for grass and gravel drivable surfaces. Large rolls sizes cover areas quickly while either protecting grass roots from compaction or containing small gravel to eliminate gravel migration. These products have extensive design brochures that cover all aspects from project photographs to latest technology and specifications. History Grasspave2 the Early Years In 1982 our first grass paving system was called Ritterings and was composed of 3" PVC white rings glued onto netting and sold in 4' x 20' mats. It was the start-a-business-in-your-garage approach. In 1988 we began molding 3" black recycled HDPE plastic rings and still glued them onto netting. This roll format made installation very easy for contractors and still is the single most distinguishing feature setting us apart from all modular pavers. Stormwater Management and Environmental Concerns Invisible Structures now has a complete line of Stormwater Management Products to choose from. Our products were developed to help manage stormwater and protect and enhance the environment.