3M 390 1262 Ear Plugs, Bell, 33 dB NRR, Uncorded, Roll Down, Disposable, M Earplug Size, Orange, 500 PK 131W44 308 lb Operating Temperature 308 lb Operating Temperature Minimum 0 Degrees F Surface Hardness Minimum 70 HRC End Type Plain Ends Country of Origin United States Box Ends Incorporate the TorquePlus(TM) system Tether Capable Standard Tool (Accessory Needed for Tethering) Wrench Product Grouping Wrenches Reversing No Anti Slip Design Yes Insulated No Head Movement Fixed Single End Double End Double End Standards ASME B107 Noise Reduction Rating 33 dB Earplug Color Orange Reusability Disposable Cord Options Uncorded Earplug Shape Bell Earplug Material Foam Pairs Per Package 500 Series E A Rsoft FX Metal Detectable No Noise Reduction Rating NRR 33 dB Insertion Method Roll Down Standards ANSI S3 Insertion Method Roll Down