Extruded and CNC-machined from 6061-T6 aluminum, Zero stem spacers feature an ultra-minimalist design that is super lightweight Sold in packs of five, each set provides spacing adjustments from 1 to 20 millimeters Weights range from 0.56 to 4 grams, depending on the size Each kit includes the following spacers: 2 - 1mm 1 - 3mm 1 - 5mm 1 - 10mm 1-1/8` Black Bag of 5 6061ALUPC/EAN/GTIN: 639266088240