Available in 10 gauge and 12 gauge. One ounce is 20 inches in length for 10 gauge; for 12 gauge, one ounce is 36 inches in length. 10 Gauge wire is much thicker than 12 gauge and will last much longer when making colloidal silver. It also has a greater surface area so the particles generated at a given current will be smaller in size.
We have been using silver for some years. We have always been concerned with the purity of what we use. Up to now, we have only used Canadian Silver Maple Leaf coins for this as they are certified by the Royal Canadian Mint to be 99.99% pure. The only silver wire that has been available has been only 99.9% (3 nines) pure. We have finally managed to persuade a major precious metals refinery to make a run of 9999 pure silver wire for us and we are offering them 1 ounce at a time.
If your intention is to make jewelry you do not need this level of purity. However, if you intend to end up putting something in or on your body, going for the highest level of purity (ten times) is obviously important.
A copy of the Certificate of Analysis will be sent with the silver wire. Made in USA.