It's a coaster that is also a bottle opener. 
The design is based on a reel I watched, but I don't have - please DM for credit 

corks:
https://s.click.aliexpress.com/e/_c3oNuTkJ

glue it to the top of the coaster (1 for each coaster)

silicone feet:
https://a.aliexpress.com/_c4CggOH9

comes with adhesive. stick them to the round holes on the bottom (5 for each coaster)

magnets:
https://s.click.aliexpress.com/e/_c3MokPnz

glue them to the 2 small holes inside the opener. Skip this part if you don't want the opener to hold the bottle cap. (5X1 - 2 for each coaster)

opener:
https://s.click.aliexpress.com/e/_c4dDKDA3

the openers should come with 2 screaws (make sure) and just screw it to its place (1 for each coaster)
 

cheers!