Sizes: The stopper beads about 10mm in diameter, 4.5mm thick, rubber hole: 3mm, 50pc pack. Easy for you to link these round stopper beads with other findings. Function: This stopper bead has a built-in rubber that plays an important role in spacing, positioning and preventing loss. It prevents sliding between adjacent beads, which helps to keep the beads separated. Material: The round spacers beads are made of 201 stainless steel, using safe materials. They will not cause any harm to your skin. Strong and durable, they do not rust or warp easily, have an aesthetic appeal and are comfortable to wear. The surface is glossy and shiny and does not fade easily. Wide Usage: Stopper spacer beads can be used to make various DIY crafts or jewelry making, can be widely used in bracelets, necklaces, earrings, pendants, cell phone decoration, etc. Separating them from other decorations plays a great role in layering beautification. DIY Gift: The bright stopper beads can be given as DIY gifts to friends and family, and feel the fun of creating your own jewelry items. Feel free to combine them in your own way to make your favorite necklaces, bracelets and other fashion jewelry.