Made of real wild deer ( a kind of smaller size deer) skin.
This is not only for wiping the instruments clean but also for getting the surfaces moistened. Its finest fiber is 0.0000015mm (0.000000059″) against the artificial fiber that is 0.002mm (0.0000787″).
Left : Microfiber cloth
Right : KCL Wiping Cloth
We wiped a fingerprint on acrylic plate with our KCL Wiping Cloth and a microfibre cloth the same way at only one time. Please see this big difference on the photos.