Moldex Glide® Foam No Roll Twist-In Earplugs NRR 30dB 6940 (Box of 100)Glide Foams unique multi curved stem rotates for a custom fit inside each ear canal. With its unique curved stem design, you simply push & twist for Glide to angle its way to find your fit. Glide Foam features a high NRR 30dB which is among the highest independent ratings for a no roll style plug. All Moldex hearing protection is independently tested to ANSI S3. 19 1974 by Michael & Associates, Inc., State College, PA. Unique multi curved stem rotates