Extruded and CNC-machined from 6061-T6 aluminum, 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 millimeters. Available in anodized red, blue, and black to fit 1 and 1 1/8 forks. For the best performance, stack the spacers so the vertical supports are in alignment. Each kit includes the following spacers: (2) 1mm, (1) 3mm, (1) 5mm, (1) 10mm. Maximum recommended user weight for 1″ is 99 pounds. Maximum recommended user weight for 1.1/8″ is 120 pounds.