Did you know the type of cup your child regularly uses can impact their speech development?  
When children have strong oral musculature (i.e., lips, tongue, cheeks, jaw stability), they are more likely able to clearly imitate a variety of movements needed for speech sounds. This is the core for developing clear speech. Children with weak oral motor skills have a higher risk of having a speech impairment. Straw cups and open cups are one way of helping your child develop these critical muscles that they will need to produce sounds.  Plus, they are just fun!
4" tall not including straw.