they're parchment triangles folded to make bags.
if really good at folding, can fold so it leave a hole about the size of a #1 tip. otherwise, have scissors, will cut.
after that ----
practice, practice, practice, practice, practice....
and oh, did I say practice???
(of course those of us 
who failed handwriting just might not ever get it!)
I think I have much better control writing with a small piping bag, with a tip or without is up to you. It depends on if you cut the tip small enough and a straight line so you get a rounded opening and not oval. I think a #2 tip is too bulky looking for writing, so I use either a #1 or cut the parchment bag to a #1 sized opening. If you use the pre-cut parchment triangle, just fold in half. slice through the fold with a sharp bladed knife, fold again, slice etc. till you get the smallest size you feel you can handle comfortably.
I think it's much easier to use a parchment triangle than a pastry bag for writing. We use them all the time in school (I'm in culinary school in a pastry program). They fit closer in your hand to an actual writing utensil then a bag does. The best thing to do for practice is clean off a section of your counter or use a baking sheet and just keep piping and scraping it back into a bowl to reuse. Also if you actually keep the tip about an inch away from the surface your writing comes out neater than if you try and pipe it with your tip really close. (If that makes sense!) You kind of drop the stuff instead of pushing it.
Happy piping! 
-Michelle
Do you add piping gel to your bc? I stress out when it's time for the writing!!
OMG! I noticed that too! And my husband (who is an artist and doesn't bake) says: Yeah, that sounds about right! Like he is a pro or something!
I think that is very interesting:wysmommy, about being an inch away! The girl on the website seemed to be so close! I am going to have to try that from now on! 
I find that if you add a little clear piping gel to the color you want to use, make sure it's a little at a time until the consistency is not as stiff, but you dont loose the color and use a small parchment cone it works great, it's more like a large pen and easier to handle than a large bag. I usually put my 18" triangle in 4 and use that small for writing. Unless it's novel.
Like EVERYONE has mentioned tip or no tip if up to you, try it out and see where you are. If you need 2 tips because of the writing, use a larger cone.
Another tip try to pratice not only on a flat surface but also on the side of a rounded bowl or square plastic container so you practice the up and down way!
I do this after a week-end of cakes, I just sit with a couple of bowl, spatula and practice over and over again, until I cannot re-use the icing anymore. Or that the show I am watching is done. You know like homework used to be...LOL
I always get nervous when I write. So until it's second nature, I will practice!
Good Luck
I would use nothing but bags made of perchament paper. Since I am not good in making proper bags, and I am control freak I allways use a small stapler to fix the bag and to be sure that it won't unfold.
That staple can come undone - would be bad if it ended up in the cake somehow. if you make a little slit in the top of the completed bag and fold it over itself, it acts like a paper staple"
I would use nothing but bags made of perchament paper. Since I am not good in making proper bags, and I am control freak I allways use a small stapler to fix the bag and to be sure that it won't unfold.
That staple can come undone - would be bad if it ended up in the cake somehow. if you make a little slit in the top of the completed bag and fold it over itself, it acts like a paper staple"
Yup, that is how we learned it, they call it the "old Nun staple". I guess because they used to use it when in catholic school. And it free.
Anyhow I make 2 slits in the paper and fold that back. If you really need to you can also tape the bottom of your cone just bove the tip. just make sure you use a long piece and wrap it all around, so it wont fall anywhere and mess up the cake!
Good Luck.
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