ABC Bow Corrector Violin 4/4-1/2

In my opinion, the price is high compared to other bow correctors I've tried with my students, but it's not tremendously better. It's really tight so I'm a bit afraid to break it or cause damage to my violin or my students' violins to be honest. The part where the bow goes through is relatively narrow, which I appreciate because this hole is larger than other brands. But at the same time, this means it's more challenging for those to use who have problems with bowing perpendicularly with the string. I would say for advanced players it's helpful.