Early hands-on reviews of the device say that this material has soft touch matte finish similar to that of Nexus 7 tablet. Instead of plastic, volume rocker and Power/Lock keys are made
LG Nexus 5 D821 Refurbished Unlocked 16GB 2GB RAM 4G LTE Quad-core Rear Camera 8MP 4.95" international edition - AliExpress
Amazon.com: LG Nexus 5X Unlocked Smartphone with 5.2-Inch 32GB H790 4G LTE (Carbon Black) : Cell Phones & Accessories
Nexus 5X versus the original Nexus 5 | Android Central