I bought these speaker connectors to use on the Monster brand THX speaker wires. The crimpable gold connectors are ok, however, the rubber cover sleeve is average at best. What I can't understand is the amount of loose-ness of the rubber sleeves when they are designed to stretch to fit almost any thickness speaker wire. Thus, the rubber sleeves on my Monster brand 16-gauge (standard thickness) speaker wires are very loose making me concerned that the exposed speaker wire will corrode over time due to the exposure to air caused by the loose rubber sleeves. I can't believe Monster didn't design the opening of these sleeves to be narrower so that the rubber can stretch a little and form a tight fit with the speaker wires.