70's Red and Black Sphere Stud Earrings - 70's Studs - Colored Ball Studs

This is a pair of red and black ball/sphere stud earrings. Each ball measures approximately 1/4" across. The red pair has plastic backs, and the black pair has silver metal backs. I'm guessing they're from the 70's, but it could also be the early 80's. In very good vintage condition, there are no noteworthy flaws. Please note that this is being sold as a costume piece. I cannot guarantee the age of the piece or the authenticity of the stones.