Put value first – choose an economical option for your SOLO® cold cups. Handy lids seal with a tight snap, ensuring excellent leak-resistant performance. Customers appreciate the easy-stab, X-cut straw slot and pushdown identification button options. Odorless polystyrene keeps beverages tasting as they should, without the hint of a flavor alteration. Convenient sizing design allows you to use one lid model for up to five different cup selections. Identification Buttons. Fits: 28 oz cups; Material(s): Polystyrene; Color(s): Translucent; For Use With: Dart® Cup Company RP28NPSYM.