This is a combination bike lock. It has 4 digits and can be easily reset if required. IT has a 4 foot long cable which means that it can work for all sorts of items as well as bikes. The lock is made of a strong zinc alloy and strengthened using electroplating and has a matte rubber cover which is black. It has a unique mounting bracket to fit it to the bike tube. It is really important to make sure your bike is secure if you are leaving it anywhere even at home if it is in a garden or garage so buying a decent lock can be well worth it.