I picked a couple of these up @ zZounds, and they are a nice little improvement on my bass sound. They seem to give slightly fatter sound than the hard rubber Tama beater heads I was using. I bought two, because I've been switching between a Speed Cobra and an Iron Cobra lately (that's another whole topic - I like them both for different reasons). I put it on both pedals with the same result. They produce a fatter sound due to the increased flat strike surface area and softer, more compliant polymer. To me it sounds like a heavier beater without the weight. JMHO.