The first part of all Angara rockets consists of an engine called Universal Rocket Module (in short: URM). The small version, Angara 1.1 has only one URM, while the heavier Angara 5 has 5 URMs. For this reason, Angara 5 can lift heavier payloads. The second part (called the second stage) of Angara 1.1 is called Briz-KM and the second stage of Angara 5 is called Block I. 