Single (music) - Types. 1  Singles have been issued in various formats, including 7-inch (18 cm), 10-inch (25 cm), and 12-inch (30 cm) vinyl discs (usually playing at 45 rpm); 10-inch (25-cm) shellac discs (playing at 78 rpm); cassette, 8 and 12 cm (3- and 5-inch) CD singles and 7-inch (18 cm) plastic flexi discs.
Conwy Castle. Conwy Castle, a World Heritage Site, is a magnificent fortress in North Wales. Built by James Saint George for King Edward I, it has towered over the medieval town of Conwy ever since.onwy Castle. Conwy Castle, a World Heritage Site, is a magnificent fortress in North Wales. Built by James Saint George for King Edward I, it has towered over the medieval town of Conwy ever since.
Stone Keep Castle. This type of castle soon replaced the Motte and Bailey castles as it offered a better form of defence. A stone keep was the central feature, with thick walls and few windows. Entrance to the keep was by stone steps leading to the first floor.otte and Bailiey castles were the earliest form of castles built completely from scratch by the Normans. As their name suggests they had two parts the Motte and the Bailey. The Motte was a large hill made of earth on which was built a wooden keep or lookout.