Following the success of Epsilons, here comes Prevail's next entry into the switch market! Sporting the same full nylon housing, the Nebulas come with a new long pole stem made out of LY - JWK's newest proprietary material and with a lighter but longer progressive spring. If you enjoyed Epsilons, you're guaranteed to love these just as much, or more. Top and bottom housing are made from nylon, stem is made from LY - JWK's proprietary plastic blend.