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.
The Castle was first built, entirely out of clay. It collapsed to the ground and the clay was then used as the flooring for many of the ground-floor rooms. Dover Castle is a medieval castle in Dover, Kent.It was founded in the 11th century and has been described as the Key to England due to its defensive significance throughout history.he Castle was first built, entirely out of clay. It collapsed to the ground and the clay was then used as the flooring for many of the ground-floor rooms. Dover Castle is a medieval castle in Dover, Kent.