My own Mum has a pair of these! Fabulous silver twist hoops, 25mm in diameter. Available in 20mm and 30mm also.
Sterling Silver Jewelry pieces that are not worn for extended periods of time can corrode and tarnish as well. You must ensure your jewellery is clean and dry before storage; since any moisture, dirt, oils or other residual chemicals will accelerate the tarnishing. Clean silver after wearing with warm water and dry with a soft cloth, and store silver items in an airtight container with a piece of chalk or a silica pack; the little bags you find in shoe boxes etc.