I used to only use disposable plastic pestles, but after switching to this one I will never go back. It fits perfectly in my 1.5 mL tubes (while the disposable ones often left a gap at the bottom), the construction feels solid even with forceful grinding, and the texture of the hard plastic is slightly gritty to maximize grinding efficiency. It's also tapered at the top, so your sample doesn't get stuck on the pestle like it does with many disposable ones. I was initially worried about contamination, but it hasn't been a problem. After each sample, I wash the pestle with hot water and soap, dry it with a paper towel, and then clean it again with ethanol. No contamination problems so far.