Specifications: Optimized fin-density for maximum heat dissipation with medium speed fans (20 fpi) 2-pass, single row construction Brass body and brass tubes Louvered copper fins Plenum Style: Self-purging brass plenum chambers Slim form factor (34mm) High-durability acrylic paint: Satin black finish M3.5 threaded fan and case-mounting holes Hub specifications & fittings compatibility: G1/4" flat face threaded hubs, compatible with industry standard captive o-ring type fittings (such as Swiftech "Eurostyle" series of barb fittings) ROHS compliant Weight: MCR420-XP 2lb 6oz (1501g) Quality assurance: all radiators are ultrasonically cleaned to remove solder flux as well as pressure-tested for leaks.