CharmSStory Magic Book Student Graduation Cap Charm Beads For Bracelets The Hole Size is about 4.8mm~5mm, compatible with European bracelets. As an special gift for daughters, mothers, wifes, and lovers. Ideal Gifts for Christmas, Mother's Day, Valentine's Day, Graduation Gifts, Bridal Gifts or your other special occasion you would like to make memorable. Metal: Alloy, Silver Plated if you have any question, please be free to contact us !