Extruded and CNC-machined from 6061-T6 aluminium, Box One Stem Spacers feature an ultra-minimalist design that is super lightweight. Weights range from 0.02 to 0.14 ounces (0.56 to 4 grams), depending on the size. Sold in packs of five, each set provides spacing adjustments from 1 to 20 mm. Available in anodized red, blue, and black to fit 1-1/8â forks. For the best performance, stack the spacers so the vertical supports are in alignment.