Vivo V11 Pro is made of industrial grade polycarbonate material.
Yes, You can record 4K videos with Vivo V11 Pro.
Yes, Vivo V11 Pro does have the face unlock support.
Vivo V11 Pro is just 7.9mm thick.
The Vivo V11 Pro is a solid all-rounder at Rs. 25,990 and offers better value than the Oppo F9 Pro (Review), but for a bit more money. Think of it as a Vivo X21 with a bigger battery and better front camera, but at a much more reasonable price, which is a good recipe.