that has only been the case with my super speed though !! my slim adjustable dont like them on any setting ..lol..i pretty new to the DE and i never thought that there could be such a difference in blades on ones face until i got the sample pack though .. if i remember right i think in another post someone had mentioned that they think these drug store blades are Personna blades but idk , i jus know the ones by me all come in the same blade case ,blades look identical , and only difference is the packaging