Our Box One Shift Cable & Housing Kit is the easiest way to get silky smooth and consistent shifts on any drivetrain. Replace your Box One, Box Two, Shimano and SRAM kit, or upgrade your Box Three or Box Four set-up. This kit is a combination of our best performing Cable Housing and Slick Coated Stainless Steel inner cable. In lab tests this combination has proved to be superior to most competitive product. We have data that demonstrates lower initial resistance and substantially less difference in resistance over time. See the comparison chart - the data speaks for itself. Shift Cable Resistance Chart