The Kryptonite Evolution Series 4 1090 Integrated Chain features 10mm six-sided links made of triple-heat-treated manganese steel, providing robust security. Measuring 35.5 inches (90 cm) in length, it includes a weather-resistant nylon sleeve to protect your bike's finish. The integrated high-security cylinder is resistant to picking, drilling, and cutting. The lock comes with three keys, one of which has a high-intensity LED bulb for convenient unlocking in low-light conditions. Additionally, it offers an anti-theft protection program and access to Kryptonite's Key Safe Program.