Richmar Microblock Antimicrobial Electrodes Configuration:MicroBlock Antimicrobial Electrodes, 2" Round White Cloth. 4 pk, 10 pks bg, 1 bg cs. US Sales only. and the ultrasharp 20 gauge ASG GNA233L2 and the ultrasharp 20 gauge spinal needle provided in each tray facilitates depth positioning through the incorporation of etched centimeter marks along the length of the cannula Zoll Sidestream Oral Nasal CO2 Sampling Cannula Specifications: Richmar Microblock Antimicrobial Electrodes MicroBlock antimicrobial electrodes are thefirst and only electrodes on the market that reduce the risk of contamination and help prevent infection by killing disease causing microbes and common antibiotic resistant threats that contact the surface of the electrode