This is a Starbucks 50th Anniversary Frosted Iridescent Siren Mermaid Tumbler.

It is a limited edition, collectible cold cup released in 2021 for Starbucks' 50th anniversary.

The tumbler features a frosted, iridescent design with the iconic Starbucks mermaid logo.

It has a capacity of 16 ounces.

In excellent pre owned condition