These are different from all other dock products because they are 100% solid marine grade foam bonded to fibre reinforced plastic and an anti skid epoxy coating.
The steel exoskeleton is encapsulated in Coal Tar Epoxy to prevent corrosion. It's the same type of coating used to protect steel ships.
You can drill a thousand holes in these docks, cut them in half and tie them into a pretzel and they will still float the same way. There's nowhere for water to leak into because they are already 100% solid foam cored. So, they will be floating decades from now the same way they do today.
Steel spud/piles hold your docking vessel in place. It will not move no matter the wind and wave action.
A further feature is that, unlike pontoon or plastic float docks, because they displace 100% of the surface area under them. Stepping onto these docks, they feel like a fixed dock. They just don't move