Opened, but it's new and unused. I'm selling it because the size didn't fit. This prevents food debris and oil splatters from scattering into the exhaust vent behind the stove. It's a durable exhaust vent cover that can be washed in a dishwasher, with an adjustable width (36-71cm). Size: Top/approx. 8.3cm (H) x approx. 36cm (W) Bottom/approx. 7.5cm (H) x approx. 36cm (W) Includes 3 magnetic fittings. Made of hard anodized aluminum for solid coverage. Compatible with built-in gas stoves and IH heaters up to 75cm wide. Made in Japan.