PURA-FIT EAR PLUGS ARE TAPERED SO THEY ARE EASIER TO INSERT IN ANY SIZE EAR CANAL. THEY ARE LONGER AND EASIER TO GRASP. PURA-FIT IS DESIGNED FOR INCREASED COMPLIANCE AND FEWER COMPLAINTS. THE SPECIAL FOAM IS FORMULATED FOR SOFTNESS AND COMFORT, AND THE OUTER SURFACE IS SMOOTH, SO IT DOESN'T IRRITATE THE EAR CANAL. NRR 33. HIGHEST INDEPENDENTLY TESTED NRR AVAILABLE. PURA-FIT IS INDEPENDENTLY TESTED TO ANSI S3. 19-1974 BY MICHAEL & ASSOCIATES INC., STATE COLLEGE, PA. SO YOU KNOW YOU'RE GETTING EXCELLENT PROTECTION AGAINST INDUSTRIAL NOISE. 100 CT. BOX. SOLD BY THE BOX.