The material is pretty soft, just like last year. I've read where some didn't last long last year and them some had many a thousand shots, like my Justice. I believe it depends on the performance of your bow (BlackKnight compared to the Justice for instance) and the weight of your arrow. I think the lighter arrows and higher speeds plays a big part in just how long the Bowtech string silencers and the Sims string Leaches actually last.