Toothbrushes used to come in 3 different bristle “strengths”: soft, medium, and hard. Nowadays, all I mainly see is soft, and barely any medium, and hard has become nonexistent.
If medium bristles make your gums bleed, the problem is not the bristles, it’s your gums.
“Soft bristles are much easier on gums” (and much less effective at cleaning your teeth).
And keep in mind that most likely these bristles lose their strength as you use them (that’s the nature of things), so by the time you get close to the time it’s time to change your toothbrush, you’ve been brushing with a feather duster.