Hi Bill, We use capilries 1/16 inch OD , 0.007 inch ID and 24 inches long from SUPELCO, INC., Supelco Park, Bellefonte, PA 16823-0048. Stan ============================== Professor Dr. Stanislaw Halas Mass Spectrometry Laboratory Maria Curie - Sklodowska University 20-031 Lublin, POLAND tel: (48 81) 537 6275 fax: (48 81) 533 3669