Used with test stones and solutions to determine contents of gold. Set of 5 (8k, 10k, 12k, 14k, 18k). Go to How to Use Testing Needles for more detailed information. Transline#: TES-805. Size: Set of 5 (8k, 10k, 12k, 14k, 18k). Color: N/A. Sold Individually. Case Qty: 1 .