Part #ASC-010G. AT cut, .550" diameter, plano/convex replacement QCM sensor. Electrode material is Gold (Au) and the adhesion layer is Chromium (Cr). Works with FilTech, Inficon, Maxtek, Sycon, Sigma, Satis, Edwards, and Intellemetrics. Sold in discs of 10. Direct replacement for FilTech's QI8010, only less costly.