I don't write many reviews but I was frustrated enough with this product to feel it was necessary. The red and black wires are connected, making the project easier to work with. My problem is that you have to separate two wires to connect them or you need one strand. The rubber sleeve is very cheap and even if you start splitting with a knife and then pull to separate the two colors the sleeve will separate exposing the wire. I went through the same process with another brand purchased from the store many years ago with no problems. I've tried spitting the wire out completely with a Stanley knife and it's difficult to trace the break as the red and black color of the case doesn't match the wire itself.
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