Mega Bloks, Inc. is Canada's largest toy company. It is the world's second biggest manufacturer of construction toys, and one of the fastest-growing toy brands in the world. Based in Montreal, Canada, the company sells its plastic interlocking toys in more than 100 countries worldwide and has offices or manufacturing operations in 11 countries. The company's principal product is sets of plastic building blocks. It markets to two main categories: children under the age of five, and children five and older. Its toys in the preschool category are mainly large blocks that are easy for young children to hold and manipulate. The blocks designed for older children are smaller, and indeed are the same size as the blocks of Mega Bloks' key competitor, Lego. Mega Bloks successfully challenged Lego's dominance in the interlocking building blocks category, winning patent infringement cases brought against it in various courts. Although Lego is the market leader in this category, Mega Bloks showed that there was room for more. The company's sales grew precipitously in the late 1990s, and Mega Bloks, formerly Ritvik Holdings, went public in 2002. The company is run by the sons of the founders, Rita and Victor Bertrand.