Size:4.1cm long X 4.1cm wide,space:3mm Material:Sliver Plated Metal Base Feature:These are known as Bead Cages,Spiral Beads and Lantern Spring Beads.They can be used on their own,or used them with beads inside(thread through the cage and the bead) to add a special touch to your Jewellery. The cage can stretch to almost double its size to hold any item as required.