My machine manual has the list for what I need. I keep mine in the packet they are in and all go in an old glasses case, bought organ needles and have no problems with them.

Francoisen, My needles of choice are Schmetz embroidery needles, I mostly use 75's, and 90's. I have made a color chart for all my different needles, as I have three machines. When I get a packet of needles I use a sharpy to make a line of color across the top of the needles in the pack. I have heard some people say they use fingernail polish to mark different needles. Hope this helps. Oh the 75 and 90 machine embroidery needles are both marked red. I put a black mark above the red mark on the 90's. H&*.

I have Janome, Schmetz, and Organ, and I like them all. To keep them separate, I just keep them in the package they came it, too. That way it says on the package what they are. Janome's sizes are color coded. I find I like the Organ titanium, even though they are more expensive, they stay sharp for a long time. For embroidery, use an embroidery needle, and for metallic thread use a metallic needle to avoid breaks. I'm sure others will come along that have more detailed information and more experience. My Janome 300E is just not a fussy machine when it comes to needles, thread, anything. It just works! Hugs, Marji

Thank you for your answers.
Hugs

francoisen I have this little plastic doohickey with lttle tiny drawers in it. a label on ea. drawer says, metallic, Schmetz, organ & iniversal. that keeps me straight. when I buy, they go in drawer where they belong. *4U

I can't add a thing to what the gals already have told you so here is flowers for all

Françoise dear, I just put them pack in the compartment or package they came in - it has all the info I need - if I have more than one - I always put the used one on the left. *4U

I like the Organ's needles I brought from Japan last trip. I havent change the needle in my machine ever since! Hugs, Yoriko

I switch out all the time as I like to do multiple projects including upholstery work. I keep my gently used needles in an empty Eclipse mint box (they are metal)that I inserted a foam piece into. Labeled the boxes with size and type of needles for easy locating. Hope it helps.