disposable tubes and grip

Hey, I'm a french female newbee from Montreal (Canada) I could really use some light shed on a few things please...I'm at the very beginning, simply trying to get all my basic equipment (haven't found an apprenticeship yet). I'm having a hard time finding everything in my hometown of Montreal (Canada). When getting disposable tubes and grips, do they come in magnum tips also or can I get the flat tip and fit a magnum in? Also, I get from the book (Basic fundamentals...) that one can use a round group of needle with a diamond tip, or am I mistaken? Thanks for answering!

[canvasyou]

Mag needles will fit inside flat tubes
round needle group will fit in diamond tubes - use these for lining typically - less play when they are in - versus a round tube

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