Moldex has introduced a new formulation that achieves an NRR 33 for its SparkPlugsÂ®, Pura-FitÂ®, Camo PlugsÂ® and SoftiesÂ® brand foam earplugs. The independently tested NRR 33 is the result of a new softer foam that adds even more comfort to the earplugs. The four brands come in corded or uncorded versions. SparkPlugs are available in a metal-detectable version. Moldex-Metric, Inc., Culver City, CA.