Designed for long-lasting protection to your dock. These bumpers are constructed of UV-resistant, tear-proof vinyl/polyester tri-laminate and filled with high-density, closed-cell polyethylene foam. Four corrosion-proof grommets provide easy mounting to dock. Vertical mounting holes measure 3-1/4" center-to-center. 10" x 10"; 4"H x 2-1/2"D.