The package includes: 150 4.63mm flat studs and 150 ear plugs, a total of 150 pairs are perfect for your needs, and for health reasons, you can change them every day. . Quality material: The back of the soft earrings is made of transparent silicone, soft and comfortable to wear, lightweight and hypoallergenic, safe and does not react to very sensitive skin. . Easy to use: The back of the earrings is easy to put on and take off. You can make most of the earrings your DIY needs. Its easy to grip, the soft clutch loop back protector slides easily over the posts and keeps your earrings in place without loosening them. . Perfect Design: Earring posts and clasps come with blank pin and cup design. With transparent earrings. Simple and clear. . Wide Application: These earring backs can be used for making new jewelry and to replace old or lost earring backs. .