These nail varnish bottle holders work very well with the majority of nail varnishes and gel bottles. However, one of the nail varnish bottles I use is the internationally renowned OPI who is one of the leading products in the nail industry and these nail holders are just a bit too small to use with OPI nail polish bottles. You have to force them in and its a real struggle to get them out. Aside from that, these nail polish holders are fantastic for preventing your nail polish from spilling. They keep your bottles upright on any surface. I knocked one star off for not being able to comfortably put my OPI bottles in them. There are other bottle holders but they are not as effective as this style.