This is the set that provides everything that goes into the making of a delicious glass of chocolate milk, except the mess. The Best Milk Mixing Mug has a safe, detachable mixing base that thoroughly blends chocolate syrup and milk without sloppy spoon stirring or clumping. In tests by The Hammacher Schlemmer Institute, the dishwasher safe mug’s clear flip-up top never leaked even when shaken and turned upside down. A swirly straw with a happy Holstein cow pairs with the mug to give kids a fun way to enjoy their chocolate concoctions without spills. And for rich chocolate flavor with a taste of nostalgia, nothing compares to original Bosco syrup, a kid favorite since 1928. Set includes two 10-oz. milk mixing mugs, two swirly cow straws, and 22-oz. squeeze bottle of original Bosco chocolate syrup. Requires four AA batteries. Each mug 6 3/4" H x 3 1/2" Diameter.