How do I know what size rodents I'm getting online?

Hello folks, if I was to buy rodents online, how do I know exactly what I'm getting?

Ex)
Individual Weight(g)::cens0r:50 - 89
Length(head & body)::cens0r:4.5" - 6.0"
Quantity in packs::cens0r:15

How do I know I won't end up with a bunch of 50s or does it matter?

Thanks.

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Most online rodent sellers will tell you what the weight (grams) of the rodents are. I'm sure they're not all exactly the same but I don't imagine a few grams either way would make a huge difference.

All online sellers give a weight range for each size. You just have to know your snake(s) and what size range they need. Ie, you wouldn't get weaned rats for a snake pushing 700 grams.