3M 1100 UF foam ear plugs are the stiffest of the poly-urethane foam ear plugs. For those who like the feel of UF, but want the stiffness of PVC (which makes insertion easier), the 3M 1100 is a good choice.See Also:
3M 1100 UF Foam Ear Plugs (NRR 29) (Box of 200 Pairs) (NRR 29) 3M 1100 UF foam ear plugs are the stiffest of the poly-urethane foam plugs. For those who like the feel of UF, but want the stiffness of PVC (which makes insertion easier), the 3M 1100 is a good choice. Box of 200 Pairs
3M 1100 UF Foam Ear Plugs (NRR 29) (Case of 1000 Pairs) (NRR 29) 3M 1100 UF foam ear plugs are the stiffest of the poly-urethane foam plugs. For those who like the feel of UF, but want the stiffness of PVC (which makes insertion easier), the 3M 1100 is a good choice. Case of 1000 Pairs - Best Pricing!