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.
๐งถ Susan Bates 14099 Knit-Chek: Knitting Needle Gauge, 3 by 5-1/2-Inch
8 Review
๐ Rocket 2 Squared Ergonomic Blue Cord 16-inch (40cm) Circular Knitting Needles US 6 (4mm) Bundle with 10 Artsiga Crafts Stitch Markers
9 Review
๐งถ Knitter's Pride Interchangeable Cords, 11-inch (20-inch w/tips), Blue
8 Review
Lihao 36 PCS Bamboo Knitting Needles Set: Explore 18 Sizes from 2.0mm to 10.0mm
8 Review
Soft And Durable Baby Blue Bernat Sport Yarn, 12.3 Oz, Gauge 3 Light, 100% Acrylic
32 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
Bernat Blanket Yarn, Sand
39 Review