From Amazon
ASUS ROG PBT Keycap Set, Premium, Durable PBT Material Keycaps with Shortened Stems and Mid-Height Profiles, Providing Better Click Stability and Longer Lifespan, UK Layout
OnBuy
Asus AC03 ROG PBT Keycap Set, PBT Material Keycaps, ROG Legends for Stylish Illumination
Scan
ASUS ROG PBT Doubleshot Keycap Set