About rubbers sponges

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Hello everybody, today i have a question about the sponge of rubbers. Sponges have an bigger util life? About your desgast, are big? In consideration a short pips on fh, practice every day about 2-4 hours. I have SP and i want to be a experiment removing my Kokutaku 119 topsheet and place a RITC 802 topsheet in Kokutaku 119 sponge, i will make this on two months, i use the rubber since october. The sponge will be lose your properties?
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