What’s a accurate enough firmness for horse cock?

I’m looking at exotic erotics lifecast line up and I wanna get the firmness that is close to an anatomically correct horse cocks hardness. Any details will help a bunch. :)
 
Hoi! An anatomically correct horse cock's hardness will be pretty close to medium-hardness silicone when flaccid, yet firm as fuck at full flare.
Medium is kind-of like squeezing the fat at the base of your thumb, whereas Firm is more like squeezing your fingertips.

So, pure silicone won't easily get 'firm' enough to fully simulate an anatomically correct horse dick. Some toy companies emulate that by using a firm silicone core in the middle of the toy with a softer outer layer - primalhardwere comes to mind - but all the examples I can think of are canine toys.
 
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