40mm Foam Earpads, Bag of 4

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40mm Foam Earpads, Bag of 4 • Part No. E-20-4

Measure the earpiece size from edge to edge to determine the fit for your headphone or headset

  • The Foam Earpads are 40mm from edge-to-edge and they will stretch onto an earpiece that ranges in size between 24 to 35mm in diameter
  • That is the same as between 1516 and 1 38 inches in diameter
  • The decimal equivalent would be between .945 and 1.38 inches in diameter

40mm Foam Earpads, Bag of 4 • Part No. E-20-4

  • Each Zip-lock type bag contains 4 pieces of the 40mm size headphone foam earpads
  • These black foam sponge cushions are made of open cell foam sized for headphones and headsets
  • The foam ear cushions fit a headphone earpiece that is about the size of a US half-dollar coin
  • Replace degraded foam for your own personal headphone or headset
  • Remove and peplace the foam earpad sponge cushions on headphones that are shared by many users
  • Some call-center headsets will accept the 40mm, 50mm or 60mm size earpads or cushions

You can Maintain Effective Hygiene Between Headphone Users by Replacing the Earpads

  • Refresh headphones they can be shared while remaining clean, hygienic and safe
  • Replacing the earpads helps to prevent users from sharing head lice, bacteria, influenza, hepatitis, MRSA and viruses such as the common cold and Covid-19
  • Fresh Earpads will limit users from sharing hair, body fluids and skin cells that find their way into the foam earpad material
  • Many call centers, schools and corporations provide replacement earpads to reduce absenteeism due to influenza and the common cold
  • Maintain good health and hygiene through the use of clean fresh foam earpad cushions

Three methods to measure your earpiece (following removal of the earpad)

  1. Circular Earpieces: You can measure the distance going across the earpiece from edge to edge = Diameter
  2. Oval Earpieces: [Measurement Across Earpiece + Measurement from top-to-bottom of Earpiece] ÷ 2 = Diameter
  3. Measure Circumference: Use a string, dental floss or thin strip of paper to measure the distance around the outer edge of the earpiece to get the circumference. Divide the circumference value by 3.14 = Diameter


  • Lets say your oval earpiece circumference measures 4 5/16 inches long: in decimal format that is 4.3125
    So we use this formula: 4.3125 ÷ 3.14 = 1.374 inches
  • If the earpiece diameter is 1.374 inches, you can see that our 40mm foam earpads will fit because 1.374 is between 0.945 and 1.38 inches in diameter
  • This same method works for metric measurements: If the circumference is 109mm
    We divide 109 by 3.14 and that equals 34.7mm. 34.7 is between the range of 24 and 35mm so our 40mm earpad will fit
  • The 40mm foam earpads will fit an earpiece between 5/16 and 1 3/8 inches (between 0.945 in. and 1.38 inches) or (between 24 and 35mm) in size

It is always best to base your measurement on the size of the headphone earpiece (not the old foam sponge)

  • The earpads will stretch around earpiece outside edges or fit into a thin groove in the outer part of the headphone earpiece
  • The earpad size table (shown in the earpad images) will help you to review the appropriate earpads for your headphones

Product Composition

The foam headphone cushions are made out of a polyurethane open-cell foam material that is flexible and will stretch around the circular and oval shaped earpieces. The foam material that we use is generally higher in quality (and made to last longer) than the foam earpads that originally came with most headphones and headsets. These hypoallergenic foam earpads are completely latex-free and come packaged in a clear plastic bag. No heavy metals were used in the production of our foam ear pads; therefore they are RoHS compliant.

Cover Quantity
4 earpads
Earpiece Size Inches
15/16 to 1 3/8 inches
Earpiece Size mm
24 to 35mm
Foam Earpad
Reclosable bag
4 per Bag
circular or oval

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