SafeSEAL is NOT a cover for yoru stethoscope. It actually replaces your traditional hard diaphragm and is designed to improve acoustical response while maximizing patient discomfort. This is achieved by eliminating the "cold touch" associated with cold diaphragms. Proven to kill 99.9% of MRSA for up to two weeks, SafeSEAL is impregnated with an antimicrobial compound, designed to prevent growth and migration of bacteria, mold and fungus. The soft diaphragm features four different colors, which are used to help you remember to change your SafeSEAL from week-to-week.