These rubbers comes from DHS rubber research institution.Please do not put orgianic gule on that because the rubber will be broken. This rubber is only good for forehand loop. I want to share the rubbers to who really know how to use.I only have 20, please order soon,
Sponge thickness: 2.2mm
Sponge color: blue
Rubber color: only black
Hardness: 40
The authentic code on top of the rubber surface. U can check this code on DHS official website.
If you want, please order soon! .If you have some questions on rubber selection or other relevant questions, please free contact me. I am very glad to answer your questions.