Use your touch-screen phones and iPads with your gloves on, and save those frozen fingers!
These little spools contain 2 meters of genuine, high-quality conductive thread (not just sparkly thread which doesn't work for this purpose).
You can hold it together with your yarn as you knit the finger tips, or duplicate stitch the conductive thread over the top (recommended for max efficiency).
Technical info: The thread is nano plated with silver to make it conductive. The conductive thread has a generally low resistance but it does vary. Resistance does not vary significantly from one length of thread to the next, so you should be able to use this thread without concern for "dead" sections.
The conductive thread has a breaking strain of around 9.3 pounds (4.2 kilos). It comprises roughly 96 individual filaments, each coated with a micron-thick layer of natural silver. This plating of the yarn is done in Europe to ensure as high a quality finish as possible. In construction, 16 of these filaments are wound together to form an initial twist; two of these twists are then twisted together, and finally three of these twists are combined to form the finished thread. The conductive thread is approximately 18 denier. It is heavier than a regular sewing thread, but not as heavy as an upholstery thread. It can be sewn on most domestic sewing machines using either a regular needle or the next size up. This thread does not fray.
No (or very low) fray. Conductivity = approximately 40Ω per metre (12.2Ω per foot). Count = 875 dTex. Strength 3000 cN. Elongation at break = 37%. Twist = 240Z-380S.