This model is a basic coaster for cups, mugs, and bottles.
It features a drip collector which as the name suggests collects the condensation from the outside of the cup.
The bottom is desinged to incorporate a 90mm diameter and 3mm thick disk of cork to reduce slip. This cork disk can be bought on aliexpress.( https://www.aliexpress.com/item/1005008067505838.html?spm=a2g0o.order_list.order_list_main.40.14aa1802H5UfB8)