4mm Ball Stud, White Freshwater Cultured Pearl Stud and Cubic-Zirconia Set of 3 Stud Earrings (2 cttw) Sterling Silver Ball Stud has a post and friction back, it is .1" in length and .1" in width, Freshwater Pearl Stud has a post and friction back and is .2" in length and .2" in width, Cubic Zirconia Stud has a post and friction back and is .1" in length a Made in Thailand Imported