Master Pack - 4 (four) cases for a total of 100 one hundred) individually wrapped sheaths shipped in sterile packaging in each master pack. ViRSS™ sheaths are a protective covering for the high intensity LED fibers of the DeVA-1 micro-endoscope. They come in sterile, single use packaging. The sheath locks into place to avoid disengagement and water leaking onto a patient during visual scaling and root planing or other blind dental procedures. Water flows through the sheath to clean the debrided area. OraVu sheaths are compatible with competitor endoscopes.