This is a strap, keyholder, or charm.
From the Bocchi-kun series comes an acrylic charm of Yuri Plisetsky from "Yuri!!! on Ice"! He measures about 4cm tall and 4cm wide.
“Bocchi” comes from the Japanese phrase “hitori bocchi”, meaning ‘all alone’ or ‘all by oneself’, and this series tries to depict characters in a position representative of this phrase—looking a little lonely and in need of your attention!