These PETG plates are designed to fit the Hobie Pro Angler 14 Vantage ST Seat and are 100% solid. PTEG is a material that is salt water resistant. The plates are designed as a direct bolt-on upgrade and come with 4 replacement 1/4-20 x 1 stainless steel button head socket cap screws, 1 replacement seat strap bracket, and 2 10-32 x 1 stainless steel button Phillips drive screws. Our product is specifically engineered to reinforce key areas within the hull, promoting better load distribution and overall structural robustness,While we cannot provide absolute assurances our solution is designed with these objectives in mind