From Google their 18W USB-C Power Adapter for Pixel & Pixel 2. This charger comes with a white finish. Model: TC G1000-US

Features:
- This adapter delivers a fast charge to your pixel, to keep you going strong
- The lightweight, Compact design makes it easy to Pack away and take with you on the go.
- USB power delivery (pd) 2.0 to rapidly charge your pixel 2 and pixel 2 XL Device. Just 15 minutes of charging will get you 7 hours of use!
Model Number: GA00193-US