Biodegradable Flower Cups and Star Cups are Eco-Friendly. When discarded they break down quickly, so they pose no long term threat to the environment. They are made from PLA (polylactic acid), a plastic-like material which is made from a renewable resource of corn not petroleum. The cups are 100 percent biodegradable and/or compostable. Each cup is marked with the recycle symbol PLA Number 7. The cups are not available in colors. They are available sizes 4 and 8 ounce and the Star Cup is available in the 6 ounce size only. They are not suitable for hot beverages due to the nature of the plastic. Read more about Biodegradable Flower Cups and plastic flower cups on our blog.