Bike stems are usually produced from alloy, carbon, and titanium. Stems made of alloys are robust and dependable, Stems made of titanium, on the other hand, are also strong but generally lightweight. Carbon stems have the potential to be extremely light, but they are also the priciest. While material choice might be an aspect which can influence the mass of the bike, it is worth noting that the majority of the stems within affordable price range are usable alternatives, and it is not really required to overpay for a stem as there will be performance gains.