The best way to use these markers is to use certain colours to alert you to different tasks - like a colour code. For example, you can pair two markers of the same colour to mark the edges of your raglan increases. Or use warm colours to mark increases and cool colours for decreases. We also always put the brightest, most contrasting colour at the beginning of our round, so we never forget which one it is. Another great way to use these is to mark every 10 stitches when you're casting on - it makes it super easy to count a large number of stitches.
This particular size can go up to 4.5mm (US 7) needles, making them the best choice for sock projects, or any project that uses fingering or lace weight yarns.