Vintage Czech Buttons

From my research this is what I found out about these. There are 25 in total with five of them having the little plastic ball in the middle. I’m guessing over time the other ones lost those. I have 15 of the loose balls for the middle that I’m sure could be glued back onto the buttons. I found these in my aunts storage unit and I’m not sure if they were hers or my grandma’s and I don’t sew. The image displays Czech glass flower beads, (Buttons) specifically appearing to be hibiscus flower beads. These beads are made of pressed Czech glass and feature a flower shape, often with the same design on both sides. They are commonly used in jewelry making for items like bracelets, necklaces, and earrings.