Crickets and other orthopteran insects sense air currents with a pair of abdominal appendages resembling antennae. called cerci. Each cercus in the common house cricket Acheta domesticus is approximately 1 cm long. and is covered with 500 to 750 filiform mechanosensory hairs. https://www.adventuresonabike.com/product-category/refill-fondotinta-in-crema/