When you install one of our glass filled engine mounts, your model will be lighter and your engine will have a much better chance of surviving in the case of a mishap. You see, these mounts are designed to take the shock of a severe crash or mishap and break away, protecting your engine. A metal engine mount is just as strong or stronger than the engine so the engine runs a much higher chance of breaking. Dave Brown Products' glass filled engine mounts are available in a wide variety of sizes (from small .049's up to 1.20 four stroke singles). All mounts have alignment guides, parallel mounting beams, and come complete with mounting screws.