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I would say that plastic cups are better for string telephones because you cant get string through a metal cup.
"Custom plastic cups are available for a number of different suppliers who will ship to you wherever you are located. You might try Drinkware Company, CustomInk or Stadiumcup for mail order service. Checking the Yellow Pages in your local phone directory might also produce a local supplier."
metal
Customized plastic cups are created mainly from recycled materials and Polyethylene terephthalate (aka, PET), a form of plastic widely used in the food and beverage industry to manufacture cups. They are heat and cold resistant, and are tough to break. Unlike other plastic cups such as PP and PS, PET cups are recyclable and its polymer chain can be reused. They are perfect options for juice, water, cold beer, and much, much more.
Most supermarkets sell plastic cups.
One can get plastic drinking cups from most supermarkets, party supply stores and even from home and office supply stores. Walmart has clear plastic cups. The Party People has clear, yellow, red and silver plastic cups. Redds Cups has red plastic drinking cups.
The majority of plastic cups can be reused or recycled. Polystyrene, or foam, cups are not widely recyclable. Cost wise, plastic cups tend to more inexpensive than polystyrene cups.
Plastic cups are composed of organic compounds.
Chembakolli is a place located in India. It is not far from from Kerala. There, cups are made of the same things they are everywhere else. Cups can be made of paper, plastic, metal, and tin. Jugs also work as well.
Some plastic cups are recyclable, some aren't. it depends on the material.
Plastic cups come in many sizes. There is no answer.
Some of the advantages of plastic cups are they they cost less then normal cups, and they are washable like normal cups. SO it saves you time and money.