 Browlines continued to remain popular through the 1960s, but their market influence slowly waned throughout the decade as advances in plastics manufacturing offered wearers even further frame customization via solid plastic eyeglasses, which could now be made in more shapes, sizes, and colors than in the past.Wearers who wished to wear plastic frames but still liked the browline style flocked to "plastic browlines," plastic glasses with transparent lower portions and solid upper portions, which became a major frame style of the 1960s.In 1971, Shuron sold their sixteen-millionth pair of Ronsirs.