Guala Closures is targeting the wine and spirits markets with a tamper-evident roll-on screw cap. The closure, which Guala has been developing for the past year, incorporates a coloured plastic ring that appears between the bottle neck and the closure once the bottle is opened. Guala marketing manager Anne Seznec said wine counterfeiting was a growing concern and highlighted estimates that up to 5% of fine wines sold were fake. "Traditionally this market had shied away from alternative closures, but if they can help find a solution to what is a very real problem then they have to be worth considering," she said. The closure design has been changed slightly to differentiate from a standard one, but the firm said application was unaffected and the price difference was "negligible."