Every millimeter on the steerer changes how the bike feels. I got tired of digging through the toolbox for another spacer, stacking four or five of them, and still not landing on the right height. These are one piece, made to your measurements. I've been making these and putting them on my bikes for years. Everything from Telluride to Tahoe to Austin to Sedona to racing to ripping with the crew. These things are bombproof. Sold as a pair. Specify your desired rise and the measurement to the top of the steerer. We add material above that so everything torques correctly. DETAILS Made to order , 1-1/8" steerer Below-stem: 2β90mm, 0.5mm increments Above-stem: 2β30mm, 0.5mm increments Polycarbonate carbon fiber composite Compressive strength: 86 MPa. Torque rated to 6 Nm , same spec as your stem Ships in 3β5 business days WHAT'S IN THE BOX (1) Below-stem riser (1) Above-stem riser πΊπΈ Made in the USA