Stringer coasters Stringer coasters Stringer coasters (20 ratings) Two drink mats, coasters £17.00 Quantity: at £17.00 each Add To Basket 1 in stock. My coasters are formed by fusing two layers of clear glass. I have then laid across some brightly coloured 'stringers'. They measure 10cm x 10cm (3.93 inches). Each one has 4 bumper feet to prevent the coaster sliding when used. This is two coasters for £17.00 (including UK p&p), the photograph is of the ones you will receive.