Being in the keyboard game means not only talking/dealing about different keycaps and profiles. It also means dealing with different type of plastics used with keycap manufacturing. Aside from ABS which is the common plastics used with your keyboard or stock keyboard keycaps. There is also PBT which has a different texture and also has different qualities compared to ABS plastic. Common reasons people want to use pbt is because they do not shine as fast as normal ABS plastic, they are not as susceptible to fingerprints or dirt accumulation compared to ABS. If you want to know a lot more about PBT plastic Wikipedia has nice information about it.
This modern beige set that I have came from Originative it is basically like Gateron think pbt or maybe enjoypbt. 1.5mm thick and the feel to it is quite nice. PBT is nice to type on from time to time but if you follow this website you would know that I am more on thick abs specially the Signature Plastics SA profile keycaps. Nonetheless think PBT like these are nice for someone who likes cherry profile keycaps.
Here is what my modern beige looks like and what came with the kit that I got