Stretching is a form of body modification in which a healed piercing is slowly expanded to accommodate larger jewelry. Many people refer to the process using the term "gauging", although the technically correct term for this process is "stretching". You can stretch any piercing, but the most common piercing that is stretched is the earlobe. You only need one taper to stretch multiple piercings, but many people these days will buy tapers in pairs, and wear them as jewelry. Many of the organic and glass taper varieties are intricately designed to be worn as fashionable body jewelry.
Taper Kit, Stretching, Plugs, gauging, piercing, How to stretch your ears