Pipe cleaning brushes

I've seen that people recommend pipe cleaning brushes for cleaning the hard to reach places in a razor. My question is what type of material should the brush be? I'm worried about it being to harsh and agresive for the razors material. I ordered this brush https://www.amazon.co.uk/dp/B01AXOO...olid=3ND84WRQ5X90Q&psc=0&ref_=lv_ov_lig_dp_it. I have a Wilkinson Sword Classic https://www.amazon.com/Wilkinson-Sword-Classic-Double-Razor/dp/B0012Y1FCK and I'm thinking of buying a Merkur or a Muehle. What pipe cleaning brushes you recommend that aren't too abrasive?
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