They do what they have to do. Quite easy. I've found that it's not a big deal to worry about what needle size they fit. They seem to work well with small or large needles because they are rubbery and therefore flexible. If color is important to you, this might not be the best choice. The ones in the photo are beautiful and different colors but the ones I have are orange and pale green. Of course that's subjective, but I find the colors ugly. They're needle caps, though, so aesthetics don't matter unless you have another reason colors are important to you.
Celine Lin 18 Sizes 16 inch (40cm) Circular Carbonized Bamboo Knitting Needles Crafts Yarn - 2mm to 10mm Sizes
9 Review
๐งถ Knitter's Pride Interchangeable Cords, 11-inch (20-inch w/tips), Blue
8 Review
JubileeYarn Set Of 30 Carbonized Brown Bamboo Knitting Needles: 6 Sizes From 2Mm (US0) To 3.25Mm (US3), 5 Needles Per Size
17 Review
๐งถ ChiaoGoo TWIST Red Lace Interchangeable Knitting Needle 5" Tip Set, Small: Your Perfect Companion for Precise Knitting Projects
9 Review
62 Acrylic Yarn Skeins Crochet Beginner Kit - 2170 Yards, 2 Hooks,2 Needles & 10 Stitch Markers For Adults Kids
22 Review
Bernat Alize Blanket-EZ Yarn, Bright Blue
22 Review
Crochet & Knit Starter Kit - Inscraft 52 Acrylic Yarn Skeins, 2 Hooks, Needles, Stitch Markers & More!
32 Review
Soft And Durable Baby Blue Bernat Sport Yarn, 12.3 Oz, Gauge 3 Light, 100% Acrylic
32 Review