Those are 16 oz. 12 Million Shrek themed glasses. They were recalled because the painting on the glasses contain Cadmium which is carcinogenic and can cause bone softening and severe kidney problems.

All consumers who have these glasses should stop using it immediately and return them to any McDonald branch and demand a full refund. McDonald’s will post refund instructions on their website soon so please do check that out.

For more information, contact McDonald’s toll-free at (800) 244-6227 Monday through Friday between 9 a.m. and 5 p.m. Central time, or visit the company’s website.

Resources: Babycenter.com