If you are referring to toothbrush cases then yes, most of them are made out of plastic, its not a very durable material but it is very cheap and does a very good job of protecting toothbrushes from dirt.
Most are made out of hard polyethlene plastic. Brush bristles may be palmyra fiber, nylon, polyester, polypropylene, or polyethylene.
orange plastic
See-through plastic
no, they should not be made of same material because handle of brush is made up of plastic ,which is made up of very toxic chemicals. If bristles are made up of plastic then it will be very harmful for our health.
In most cases it is a plastic hose usually made of unvulcanised rubber
Steel Wire in most cases but they can be made of plastic, or aluminum.
Older TV cases were made of a plastic called 'Bakelite'
They're made using plastic injection moulding.
It is tough but very brittle
There are a variety of options for Blackberry cases. The average case is made of plastic, but you can also find higher quality leather cases or lower quality silicone like cases.
conputer or shall i say laptop cases are not made from plastic they are made from rubber BTW.... i made that up off of the top of my head LOL
Newer PS3 keep cases are made of Polycarbonate, generally clear, but may be clear with color as well.