This part reduces cooling flow into the cowl for winter operation and is available in different sizes and colors, with and without turbulence generators. Weight = 30 grams.  Material = ABS plastic.   First flex frequency is 174 Hz and well above both 2 and 3 bladed propeller driving frequencies.   Fly with confidence.   Once drilled for mounting holes with nut plates, it is a five minute installation time total, both sides.  Includes both left and right hand side air dams, two parts.