Small, fleshy, nublike feelers that are used to detect vibration.
Their shape varies, but they tend to be thinner at the base and tip, fattening around the middle. It's not unheard of for these feelers to be completely spherical!
Note: They should remain similar in size to the illustration. Bunches of feelers cannot occur from one point in groups of more than three.
Deviations of these (i.e extremely large, wide, or more than three bunched feelers) will require the clustered feelers upgrade.