Interlocking aluminum slats lined with heavy duty vinyl Slats, clamps, and vinyl are all matte black for the ultimate sleek appearance Slats are capped to protect your hands and ensure easy use of the tonneau cover The X4S side seals are flattened for a more streamlined look Rotational locking rail system secures the cover when closed The cover can be opened and locked in place with included buckle straps to haul large items Built-in bulkhead seal protects your cargo from rain, snow, and other elements Does not block access to stake hole pockets With its matte-black finish, ease of use, and impressive security, The BAK Revolver X4S is one of the most elite hard rolling tonneau covers available for your truck. The X4S truck bed cover is made of interlocking aluminum slats, which are covered with a heavy-duty vinyl tarp to produce a smooth appearance and protect your cargo from the elements.