If a boat lift is selected with wooden bunks, IMM Quality Boat Lifts will send weights to insure that the cradles will not float. IMM Quality Boat Lifts’ revolutionary Perma-Bunk aluminum bunks, which come with white vinyl covers, prevent any cradle-floatation. The aluminum bunks and covers are guaranteed for 10 years. While there are inferior aluminum bunks available, they don’t incorporate a custom extrusion “internal I beam” structure. This piece integrates the white vinyl covers perfectly, without the need for top rivets that might scratch your hull.