The Economy Extrusion includes a frosted polypropylene cover which protects the LEDs from dust while hiding direct view and softening the light distribution. Overall dimensions are 5/8″ wide and 1/4″ high, making it useful for cabinets, shelving, displays and niche/accent lighting. Use end caps made of durable polypropylene to finish the look. Standard assembly offers IP20 protection; Use a neutral silicone sealant at each end and along each side of lens for IP65 rating.