Cross-cut slot simplifies straw insertion. Cup-hugging lip ensures a tight, secure fit. Slightly raised rim allows you to stably stack one cup upon another. Material(s): Plastic; Color(s): Translucent; For Use With: SOLO SD12 - 12oz. For use with Plastic Cold Drink Cups PX12 - 12oz, PX14 - 14oz, P16, PX16, RTP16, TP16, Y16SJ - 16oz, PX18 - 18oz, PX20 - 20oz, D24, DXT24, RTD24, TD24, Y24JJ - 24oz, TD26 - 26oz.