WeldingCity 8 Silicon Nitride Ceramic Cups 54N14 54N15 54N16 54N17 for TIG Welding Torch 17, 18 and 26 TIG Silicon Nitride gas lens ceramic cups for use with Weldcraft style WP-17, WP-18 and WP-26 torches. Work with 10N series collet and 45V series gas lens collet body. Package includes 8 Silicon Nitride cups: two 54N14 (#8), two 54N15 (#7), two 54N16 (#6) and two 54N17 (#5). Silicon Nitride is a material with high thermal shock resistance, high strength at elevated temperature and high rear resistance. You get Eight (8) 54N series Silicon Nitride cups at this price. We use U.S. Postal Service (USPS) as main carrier. Please provide a USPS deliverable address.