The 33 mm cube is widely regarded as the 'standard' acrylic. This one, the distressed rounded edged cube reprents a freshly hewn cube of clear ice where fractures in the ice have caused corners to break away, and the ice has had time to begin melting, either in the drink, or in an ice bucket. Probably the most versatile pieces, they can be used in a wide variety of drinks shots.  Shown with 23mm cube for scale - not included.