These are high quality tape and shell cassettes for the price. The shells are assembled with screws (not glued), there is no warpage (shells are straight and true), they come with an internal pad between the tape and shell for smooth reeling and unreeling and the felt pad is firm and looks to be quite durable. Choice of colors is a plus! The only drawback (a minor one) is the lack of breakable write protection tabs (easily fixed with a bit of tap over the existing hole). Thank you for an excellent product!