They are hard and strong. They sink in the water., metal, They are hard and some are strong. They float in the water., wood, They are flexible and float in the water., rubber, Some are strong, some soft and some are hard. Some are flexible and some are not., plastic, They are transparent. They don't float in the water and not flexible., glass, Allows water to seep into it., absorbent, Do not allow the water to seep into it., non-absorbent

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