DescriptionAre you looking for a professional, yet affordable American tubeless bike stem? Are you in search of a sturdy, trustworthy tool that can do multiple jobs? If yes, look no further! Our professional stem core must meet your needs. It is one of the best choices for you.Features- Color: Silver and Red.- Material: Zinc Alloy. - Size: 2.00X0.40X0.40cm/0.79X0.16X0.16inch. - Made with premium zinc alloy material is durable and safe to use. - The product is designed with good texture and fine workmanship, very practical. - Designed with a seal attached to a movable, spring-loaded pin that allows pressurized air to pass when inflating a tire. - The bike core is easy to install and disassemble, convenient to use. - Each package includes 100 pieces of American bike stems cores, large quantity enough for your bike.