Half Rounded Polystyrene Ring 30cm - The Mulberry Bush Polystyrene Half Wreaths / Rings which are approx. 30cm (300mm) width / diameter. Pin it, paint it, decoupage it, rag it, weave it, knit it, model it - whatever your hobby or craft, a versatile starting point to make something amazing today! Polystyrene Rings Half Rounded Polystyrene Ring 30cm - The Mulberry Bush Wreath Ring This offer is for a pack of Craftmill POLYSTYRENE RINGS x 300mm (30cm). Made from High Density Polystyrene. 30 cm (just under 12) from outer edge to outer edge... Choose the number of rings you require & click to buy. Flat backed which is ideal to mount on a wall or place on a table, so are perfect for designing a Christmas decoration or table centrepiece. 30CM ROUND WREATH – Raising Flowers Diameter of inner circle/space is 18., 5cm (approximately)