Ars calculates the size of the DualShock 4 touchpad: about 2.1” x 1”

A little image wrangling (and math) generates a general sizing estimate.

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PlayStation Controller Dimensions & Drawings

Joyonway PB554 Capacitive Touch colour spa touchpad

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DualShock 4 CHU-ZCT2U Touchpad Replacement - iFixit Repair Guide

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[Compatibility]: This touch pad fits for Sony PS4 game controller. [Wearable and durable]: The touch pad is made of high quality ABS material, durable

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Project Caliper: the journey of prototyping optimal controllers for VR - The Ghost Howls

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