3x 10mm 5mm 3mm 2mm This product is a set of black aluminum headset spacers designed for bicycles. The spacers come in various thicknesses of 2mm, 3mm, 5mm, and 10mm to provide the desired adjustment for the headset. Made from durable aluminum alloy, these spacers are lightweight yet sturdy, making them a reliable choice for cyclists looking to fine-tune their bike's headset for optimal performance. The sleek black colour adds a stylish touch to the bike while the high-quality construction ensures longevity. Ideal for cyclists seeking precision and reliability in their bike components.