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.