Radical Deal Universal Detachable Large Black Motorcycle Scooter Luggage Tail Trunk Top Hard Rear Case Box 51L helmet rear top box for Motorcycle/Motorbikes/Scooters/Mopeds Large Enough Space To Hold 2 Full Face Helmets With enhanced built-in reflector for higher road safety and visibilit Complete with universal mounting plate and fittings,easy assembling and quick release (2 keys included) Material: premium polypropylene; Capacity: 51L; Dimension: 22.6" x 16.5" x 11; Mounting Plate: 13.4" x 11";Weight: about 9.3 LBs