I buy these nonreflective heavy duty sheet protectors for my music. The constant flipping of pages in a binder is hard on the punched holes. A standard weight sheet protector doesn't hold up and they reflect any lighting making it difficult to see music while playing. The only thing I would like to see is a larger box be made available like the 100 count in the standard weight.
These do the job of keeping papers protected but are challenging to open. I would like them more if they were more non-reflective. I like their thin plastic because I can fit more pages in a binder. They are also strong and can take a lot of handling without getting damaged.