At this time, the silicone firmness we mainly sell our models in is super soft (shore hardness 00-20), soft (shore hardness 00-30) and medium (shore hardness 00-50). We rarely, but on occasion sell firm (10A), but it can cause issues demolding, a strain on our wrists, and do not use often in our models unless it's our suction cups.
Soft (00-30) can be slightly tacky and has a similar softness of a gel shoe insert or body tissue. It is very squishy and sometimes bigger toys can have issues standing and sway more. Medium (00-50) is still squishy but can feel almost like a tad softer than a rubber eraser or an unflexed muscle. Firm (10A), feels like a flexed, tight muscle and does not have a lot of squish to it. With that being all said, since this is a handmade craft, there can be some variations to the firmness. This can can be because the size of the toy, (smaller toys will feel generally softer, and the bigger you go, the less soft it feels), temperature, humidity, pigments used (the more pigments/glows, the firmer) and even the silicone differences from the manufacturer. All our toys will be labeled to the hardness they were poured in!
We also now use super soft (00-20) for mainly packers,penetrables, squishies, and some bigger toys able to stand in it! Super soft can be tackier than the rest, but has the most squish.