CUPERTINO (CBS SF) — A curve may be the straightest line to remaining on the cutting edge for Apple.

With waning iPhone sales, the Cupertino-based tech giant is testing more than 10 prototypes for its new iPhone and some of them have curved screens, according to the Wall Street Journal.

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The new technology is based on an OLED display and boasts deeper blacks, higher resolution and a longer battery life. Apple would rely on Samsung to supply most the screens.

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Curved screen rumors have been swirling for weeks now as Apple approaches the 10th anniversary of its iconic device.

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In October, the Nikkei Asian Review reported the curved iPhone 8 will have measure 5.5 inches, feature a glass back and metal frame and have wireless charging capabilities.