Pre-fabbed Aluminum Bunks feature a black vinyl extrusion pad on top attached with aluminum rivets. This is the premium bunk for your boat lift, the bunks are constructed from 6061 structural grade aluminum, they are made from this type of metal to provide your boat with the maximum amount of support while adding as little weight as possible. aluminum bunks are also corrosion resistant and unlike wooden bunks they aren’t buoyant so they will never cause your cables to bunch. Call or email now for a quote today.