Made from sterling silver, argentium silver, yellow gold-fill, rose gold-fill or niobium (colored or natural). This new design accentuates the INFINITY of the sub's commitment to her Dom. The symbol of eternal love and devotion ... the infinity symbol refers to a quantity without bound or end. Just as your commitment is endless ... so shall the symbol of your commitment be as well. The perfect collar for a commitment ceremony, to symbolize the endless devotion of one to another.