I bought these 28 brand NAKAMICHI banana plugs (legendary Japanese brand especially known for its turntables K7 very upscale like Nakamichi Dragon 30 years ago) to connect my speaker cables 4 mm2 on my new audio amplifier / SONY STR DA2800ES video to replace a SONY STR DA50ES because it becomes very complicated to connect all these speaker cables to the rear audio / video amplifiers without banana plugs. Quality sheets delivered in bulk in a plastic bag will protect the cards too. Small problems with 4 records (One of the two fixing screws too screwed cable factory worries adjusted with a little patience to three of them. Just finish tighten the screw thoroughly and then highlight by Inside the banana plug, then tighten the outside, otherwise if you try to unscrew the screw, the screw thread screwed practically guaranteed) .This happened to me with the first of 4 records but as the speaker cable is held by two screws on the banana plugs 28, 27 are perfect and one has a screw to secure the cable. The cards fit perfectly in place without play into the connectors on the amplifier and are ideal for 4 or 6 mm2 cable section. In conclusion 5 stars for the quality of the product and the very contained price. Less than 94 Euro cents detail.