100% Nylon Set of 4 NFL-sized pylons: 4" x 4" x 18", each pylon weighs about 2 lbs Each pylon is anchorless and stands on its own, great for uneven or sloped turf and windy days Durable and visible fluorescent orange vinyl-nylon cover Safe, poly-foam core with weighted bottom More precise, meaty and visible than corner flags or other improvised markers