I purchased this wire to supply my cerwin vega XLS 215 Dual 15" 3-way speakers(500 watt max)when the wire arrived it was obvious that this was not 10 AWG(american wire gauge). I had some old radio shack Megacable that is 12 AWG and it was clearly thicker than this wire by about a third. So don't be fooled by the GAUGE rating of cheaper china made wires such as this .Make sure the wire is rated in AWG it will be about twice as thick as this wire rated in gauge. I had also tried the DB Link SW10G100Z 100 Feet 10 Gauge Speaker Wire with the same results. When I did find true 10 AWG wire the price was 100.00 for 100 foot roll so I went with GLS Audio Premium 12 Gauge 100 Feet Speaker Wire - True 12AWG Speaker Cable that is rated up to 600 watt for only 28.00