What should I check before buying Protec instrument accessories?

The Protec NC310M Saxophone Strap is listed at 22 inches, with a best new price of £21. Before buying, confirm how that measurement is taken and whether its adjustment range and attachment suit your saxophone and playing position.

The Protec M409 French Horn Double Mute Bag has a modular divider, with a best new price of £75. Check its internal dimensions against your two mutes rather than assuming that any pair will fit.

These listings establish their intended uses, but don't provide enough detail to judge comfort, padding or long-term durability. Fit comes first: a strap needs to sit comfortably, and a mute bag needs to accommodate your kit properly.