Titanium Threadless Prong Set Crystal/CZ/Opal 5-Cluster Bar Top. Manufactured from High Polish Implant Grade Titanium (Ti-6AL-4V-ELI ASTM F136). To secure the inside bar or base, add a slight bend to the pin by simply inserting the pin halfway and pushing the top to one side. Pin Size: 0.45mm x 4.7mm.Featuring prong-set five gems for beauty, these petite bar tops are a great way to let your true colors shine! Choose from 5 opalescent Synthetic Opals, or 5  rainbow colored Cubic Zirconia or Synthetic Opals.