The patent-pending Fast Track system consists of: extruded aluminum support channels flexible centering cushions aluminum support clips screws shims backer rod sealant Installation is, literally, a snap. Once the starter channel is installed, transition channels are secured from bottom to top - ending with a top receiver channel with an integrated drip edge. The stone units themselves slide or click into place for a sturdy, secure fit. To complete the installation, backer rod is set in each joint and sealed with silicone. Sealants are available in a variety of attractive colors.