800 gauss ferrite magnets. Accu-Band are the most popular acu-magnets. 24k gold plated (GP) or non-plated (NP) 0.09"x0.2" dia magnets with a 0.8" dia adhesive plasters. The bionorth (-) side contacts the body. This bionorth (-) side also features a tiny protrusion at the center of the magnet which provides additional stimulation to the point. Black is a pack of 10, while Gold is a pack of 12.