MACK’S EARPLUGS SILIC PUTTY 2 provides long-term comfort with its medical-grade, non-toxic silicone construction. Enjoy up to 32 decibels of sound reduction, with the earplugs designed to contour to your unique ear shape. Sleep soundly, swim in peace, and study in quiet – SILIC PUTTY 2 is the perfect answer to your sound reduction needs.