When you buy blades make sure they fit which scalpel handle you have, I know the Swann Morton No3 and No7 Handles take 10 - 10A and 11. I don't know what the No4 takes though.
That's another point, I have 2 handles, No3 and No7, the 7 is much thinner and easier to turn for corners than the fatter 3, so I have both on the go at the same time, the 7 has the newest blade in it for cutting masking, then if I need to cut a loose mask or anything else at all I use the 3 which is not as sharp, every time I put a new blade on the 7 I transfer it's blade to the 3 and the one on the 3 goes into my sharps box, it might seem a hassle but you keep an ultra sharp blade on your best one then and only use it for masks.
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