Full weight with thickness marked on each rigid-core roll to meet building code specificationsTough, seamless plastic for tough jobs in construction and agriculturePolyethylene sheeting"poly-film" bulk clear - 4 mil - roll wdth. X lgth. 12 x feet 100 Tough, seamless plastic for tough jobs in construction and agriculture. Full weight with thickness marked on each rigid-core roll to meet Building Code Specifications, complies with ASTM D-4397-84. Bulk.