Very well made pure copper wire with very heavy shielding on the outer sleeve and separate wire sleeves I bought this to add 18ft to my speakers run my powerful rack system. 200 watts per channel requires 16 gauge pure copper or 14 gauge plated copper. Hopefully the black sheathing will fade better from my dark wood floors. The diameter is just under 1/4 inch, so if you are drilling a hole for the wire, a 1/4 inch drill bit will do. I am very satisfied with this product. It's a bit stiff, but very manageable. It flexes well in corners and holds its shape well with memory. Very good price for pure copper. Delivery was fast
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