Bib numbers are made of Tyvek (r), a durable, plastic-like paper product, and are meant to be fastened onto a t-shirt or racing vest while moving with the participants' bodies. A bib number is used by officials to identify each rider at races where multiple riders finish together. The first two digits of a bib number indicate which race it applies to. These can be either domestic or international. If the bib number starts with 9, for example, it indicates an international race. The next three digits are assigned by the BCS to identify the team in terms of competition level. For example, a bib number of 0123 would represent Team Alpha Male. BCS standings are determined based on the results of world-class athletes called "contenders". At the end of each year, the BCS determines the order in which they will award contracts. This year, for example, Team Alpha Male was ranked first because Alex Osterman had less time in the sport than Luke Rockhold or Jon Jones. When two teams have equal rankings, they will receive contracts simultaneously. A bib number is useful when trying to identify who is wearing what during a mass start. It's also helpful to know who has been disqualified after leaving the starting gate.