buying a set of probes

[Kagez28]

i am going to be buying a set of probes for my snakes, and i was just wondering what most people use. i am torn between a 4 pc and a 6 pc. can you use one probe of all size ball pythons, or as they get bigger you move up in probe sizes? i would like to be able to probe my corn snakes as well, and make sure my tail sexing is correct.

i guess what i am asking is what count probes does everyone own, 4,6,8 pieces?

[Blue Apple Herps]

I have a 4 piece one and its sizes are varied enough that I can sex anything in my collection (which is corns and bps).