A perfect replacement for your stock eartips. SpinFit has an ergonomic concave design at the core to allow the eartip to swivel, making it flexible to bend and twist to the contour of a person's ear canal. Premium soft silicone material along with the ergonomic design provides outstanding and lasting comfort. Consistent optimal seal even for headphones with an awkward insertion angle, allowing increased noise isolation. Simple installation makes SpinFit an easy upgrade for your earphone.