ARK's Sip-Tip makes drinking easier for individuals with difficulties generating and maintaining suction. The set includes: 1 eight oz. tumbler, 1 spill-resistant lid, 10 One-Way Straws, and 1 *free* Lip Blok (yellow, 3/4"). The One-Way Straws have a unique valve built into the bottom of the straw that controls the flow of liquid - fluid flows up into the straw, but does not empty back into the cup. Because fluid stays at the top of the straw, less air is ingested and less effort is required for each sip (notice the juice staying at the top of the straw in the picture).