Size: about 4mm wide 5mm long 1mm thick; hole: 0.5mm. Quantity: 200pcs totally; Material: Well made brass connectors will work great for your jewelry and do not tarnish easily and hold up really well. Make Items Durable: These wire guards are great when making a necklace or bracelet. The wire or cord is threaded through a bead crimpthen through the wire guard and clasp and back through the bead crimp.The bead crimp is crimped thus holding the clasp and wire guard secure. Easy to Use: simply put your crimp on your Tiger tail first then feed your wire up one side of the guardian then down the other side and back through your crimps. Pull your crimps up and squash as normal. Application: They can be apply on ID lanyardsusing string for pearls though or anything you wear every day that often get snagged on things. They do add a more professional/high-end appearance and longevity to handmade pieces.You will really like the fact that your work is more stronger and worry free.