10 Pack of 3×3″ Amrex Replacement Sponges

SKU: Am-Insrt3x3


This 10-pack of 3×3″ sponges are used as replacement sponge inserts for 3×3″ tDCS electrodes.

Over time, electrode sponges lose their integrity, leading to uneven current distribution and less effective tDCS sessions. In addition, using degraded sponges can sometimes cause tingling or itching sensations, especially during the start and end of tDCS sessions.

We usually recommend that electrode sponges be replaced every two weeks, or once every seven tDCS sessions. However, the best results can be obtained by using fresh sponges for each session.


Compatible with: 3×3″ Amrex Sponge Electrodes

*Amrex Rubber Electrode not included

Out of stock


3×3″ Replacement Electrode Sponges

These 3×3″ sponge inserts are used to replace the original sponges that come within 3×3″ Amrex Sponge Electrodes. Additionally, these sponges can be used by themselves as makeshift electrodes by using our Alligator Clip Electrode Cable (or Alligator Clip Adapters if you have one of our older products).

Over time the sponges within Amrex electrodes can grow brittle and crumble, crack, or split causing an uneven distribution of current, reducing the effectiveness of tDCS. Additionally, worn-out sponges can cause an uncomfortable tDCS session, with increased tingling, itching, and sometimes mild stinging sensations occurring. Therefore, it’s a good idea to replace your sponges regularly to ensure your electrodes function properly.

Through our own real-world testing, we have found that it is best to replace tDCS sponges after two weeks, or every 7 tDCS sessions. However optimal results can be obtained by using new sponges for each session.

Additional information


Sponge Size

3×3 inches

Compatible with:

3×3" Amrex Sponge Electrodes

Country/Region of Manufacture