Set of Four (4) 15-oz Chalkboard Mason Jar Beverage Cups ~ 4 Clear Glass Drink Cups with Metal Lid, Straw and Chalk Included Set of Four (4) glass Chalkboard Mason Jar Beverage Cups with metal lids & straws. Perfect serving cup for blended drinks, smoothies and other cold beverages. Dimensions: 3.5" diameter x 5.3 High, Capacity 15-oz each. Write on these jars with included chalk and wipe clean with a damp cloth. Ideal for writing contents, a clever comment or names.