In February and March 2005, the European Commission (Commission) carried out unannounced inspections at the premises of Pilkington and Saint-Gobain as well as at the European subsidiaries of Asahi and Guardian, all of which are flat glass producers. Following a detailed investigation, the Commission discovered that the parties, which share 80 per cent of the flat glass market in the EEA, had participated in a price-fixing cartel between 2004 and 2005. The cartel raised or stabilised prices in relation to flat glass for the construction industry. Such glass is used in the production of windows, glass doors and mirrors. On 28 November 2007, the Commission announced that it had imposed fines totalling €486.9m on the participants.