Powerful NRR 33 Noise Reduction, Comfortable Fit
Economical, lightweight, single-use foam plugs deliver a powerful noise reduction rating (NRR) of 33. Compress a plug between the finger and thumb for easy insertion into the ear canal, and the bell-shaped foam expands to fit your individual ear size for a comfortable fit. Red, white and blue colors stand out at the range.
Big Book Catalog, Issue:67, Page:369
New Product Supplement, Issue:641, Page:014
Sinclair, Issue:4B, Page:231
SPECS: Molded foam, red, white and blue. Approximately 1" (2.5cm) long, 7⁄16" (1.1cm) diameter. Sold in 20-pak.