Weight: Approximately 19g (actual measurement, may vary) Contents: Dedicated black top cap (aluminum) M6 cap bolt (stainless steel) M3 cap bolts x 2 (stainless steel) Mount base (resin) *Actual measurement under 3g Hex wrench This item allows you to mount a cycle computer on your bicycle's stem. It replaces the top cap (stem cap), resulting in an increase of only about 3-5g. Use the included mount base, which is compatible with various brands, on the dedicated top cap. Garmin, Bryton, and Cateye mount bases are included. For iGPSPORT, XOSS, and other Garmin mount base compatible products, please check compatibility on the manufacturer's website. Be aware of potential interference between the cycle computer and your body when stopping. Mounting may not be possible depending on the stem angle and equipment shape. Please check before purchasing. Please be aware that your line of sight will be further away in a forward-leaning posture. This is recommended for those who want to install a second device such as a smartphone or logger, or who want to save even a few grams. Shipped via anonymous delivery. If you purchase with other items, we will discount the shipping cost if they can be shipped together.