Starbucks Red Shimmer Siren Shell Plastic Cold Cup Tumbler with Straw 24oz. This beautiful siren-inspired texture surrounds the 24oz plastic cold cup tumbler with a touch of shimmer to finish. Double-wall plastic cold cups. Screw top with silicone lip. Reusable straw in red. Material: Plastic. Color: Pearlescent Red (dusty rose). Size: 24oz. Cold beverage only. Hand wash only. Comes with Starbucks paper bag as pictured.