The Apple iWatch may be three years off, since that’s about as long as it will take companies to start rolling out flexible displays, which the highly anticipated (but as yet unconfirmed) device is rumoured to based on.

Corning produces Willow glass, which companies could use to create flexible or curved displays. But according to Bloomberg, president of the firm James Clappin said in an interview: “People are not accustomed to glass you roll up. The ability of people to take it and use it to make a product is limited.”

Cornign has made the glass and is making “a lot of effort” to teach “very big name” customers how to use it – but the firm estimates we’re at least three years off before anyone will produce proper consumer electronics with them.