The coffee shot observation mirror is crafted from stainless steel, polished mirror well that provides a clear and undistorted view during extraction, it is unbreakable, rust-proof, no worried about falling or moving, sturdy, last for long use. Espresso shot mirror offers invaluable into the extraction process, allowing for real-time observation of coffee rate and potential channeling issues, to achieve -level . The magnetic adjustable base of the mirror is strong enough to hold the mirror securely and compatible with all bottomless portafilters, it's easy to position and stay firmly in place during use, and a nice addition for coffee machine. The espresso mirror stand features dual ball heads with 360° rotation capability, and features a wide 65mm diameter mirror, allows you to monitor coffee and extraction quality from every angle, perfect for home and professional coffee station. The coffee shot reflective mirror is a surprisingly simple yet ingenious accessory for any espresso enthusiast looking to perfect their craft, also helpful for those new to using a bottomless portafilter, ideal gift for home baristas & professionals alike.