Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Which handle type are these?  Some look like plain black plastic and some have metal.
Document: Wait a bit, push down the press and drink. The whole mug is well made out of metal and high quality plastic and rubber. The bottom stores a cannister which holds enough coffee or tea for another cup or two and the seal is tight enough to keep it fresh.I read another review of the mug somewhere and they complained about getting coffee grinds coming through.
This is a genius item for any traveller or anyone away from home all day who would like to have their choice of brew close at hand. Equally as fabulous were the people @ Liquid Planet who sent this out. Incredible and beyond accomodating customer service w/ instantaneous shipping. All retailers should be so committed- many thanks!
I bought two of these to brew tea. I work as a private chef in several homes and bring tea to sip on all day long. These are sturdy, well constructed, slip-resistant and just plain practical. I hand wash only, but am quite pleased with the quality. It would be great for coffee as well.
Coffee used for french press preperation is supposed to be a coarse grind. I think that person tried using store bought ground coffee or just didn't know any better and put finely ground coffee in. The mug will do a pretty good job even with coffee like that, but some is bound to get through that way and you get a muddy cup besides the point so use coffee made for french press brewing not finely ground coffee and you will love this mug!
This travel press is great! I use it for making tea. Once I press, the double screen keeps the leaves out of my tea. It also keeps the tea HOT for a long time! The mug is very easy to clean out by hand. I haven't used the container for holding extra tea yet, but I know it will come in very handy at some point!
Owned for about a month and used most days. Keeps coffee hot enough for long enough. Secret shot compartment comes in handy occasionally. Fully satisfied with purchase so far and hope the mug will stand up to many years of use to justify the premium price.
If it tips, it will spill! Having said that, it is still the best travel press I have found!
I've purchased a total of 5 of these mugs now (different colors). They're well-constructed and attractive. I wouldn't hesitate to recommend them. I've put 3 aside for Christmas gift giving. I think they're uniquely perfect for that person who seems to have everything, without spending a fortune to achieve that "Wow!" factor.
I was thinking about a way to make coffee at work where there was no coffee machine easily accessable. I thought a french press would be a great idea, but all of them seemed to be made of glass and I didn't want to leave my press laying around where I work (we share space with other companies so people come and go).
Answer: I have the black mug, and the handle is a heavy duty metal rod with a black rubber overlay, and is screwed into the wall of the cup.  It is definitely more sturdy than it looks in the picture.