16oz mini shaker with a unique 3 piece design made of First Quality, High Density Polypropylene plastic. It includes a durable polypropylene plastic cylindrical sieve that produces a perfectly blended drink every time, a tight, snug, leak proof, triple thread, screw on flip-top cap with an easy-flow spout for easy drinking and the latest in plastic molding technology, that actually does not require a thermoplastic rubber seal to be leak proof. (It does not require an inferior foam core seal like most companies use that either falls out of the lid during cleaning or eventually breaks down and leaks!)