I find it more convenient to take the whole set so that one can choose the right dimension. As stated the set contains 3 buttons(high, medium and low, low being the one that is also standard on the PX4), made of strong plastic with aggressive checkering. All of them can be mounted without any special tools-I used a thin punch that fits in the hole on the opposite side from the button). So far, I tried for function the tall one and I can reach it much easier than the standard low one, as it is both taller and wider but I will swap for medium as it digs a bit into my left palm due to my shooing grip. Other shooters that tried it did not have this issue so I think is personal(and because of that I am glad I bought the whole kit). The checkering is aggressive and my thumb/finger either with gloves or without will not slip off of it. Overall good product. Would recommend as an improvement.
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