Flex Keel Pad - Full Cap Style - 12" x 3" - BlueThese Thermal Plastic Rubber (TPR) pads cushion the trailer cross members to protect your boat keel. Full cap style mounts on the center of any 3" wide cross member or axle that the keel might hit.Features:. Blue TPR. 3" W x 12" L. 5/16" thick. 3/4" deep sides for mounting. Mount using four rivets or screws, two through each side (hardware not included).