My lights arrived today. The box weighs about 6.5lbs. Lights seem fine no damage in shipping. The mounts are metal. Only problem I have is the plastic screw is to long. My tank is to far back so used a very old hack saw and cot one. Fits but will need to use pliers to securely fasten. I have 3 more plastic screws to cut down and will pickup new blades tomorrow. A few pics unassembled.