Math Protractors, 24 Pack 180 Degrees Protractor for Geometry, Clear Plastic Protractor for School, Office, Home, Teacher, Students (4 Inch) Smart Glasses Mounting: The explosion proof monitoring

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57" (40 mm) Cable Length 6 ft Impedance 25 Ohm Sound Pressure Level 105 dB Connectivity Technology Wired Features Adjustable Headband Chew Resistant In-Line Volume Control Noise Reduction Durable In-Line Controller Rugged Comfortable Minimum Frequency Response 20 Hz Maximum Frequency Response 20 kHz

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Math Protractors, 24 Pack 180 Degrees Protractor for Geometry, Clear Plastic Protractor for School, Office, Home, Teacher, Students (4 Inch) Smart Glasses Mounting: The explosion proof monitoringBrand ExeQianming Writing Instrument Form Multifunction Writing Instruments Colour 24 Pcs(transparent) Ink colour Black Age range (description) Adult 24 Pack Protractors: The package contains 24 packs of clear protractors, there are sufficient quantities for you to choose and replace, and you can place them where you often need to use them, convenient for your daily use Material: Made of plastic material, durable, surface is smooth, not easily damaged