Thank you for viewing. These were knitted with 100% acrylic yarn using Toray's antibacterial and odor-resistant fibers. Diameter: Approximately 9-9.5cm (excluding the loop) Set of 10, with loops. I try my best to knit carefully and with care, but these are handmade items by an amateur. There may be distortions, looseness, and fraying. Each one has a different texture and size. There may be yarn end treatments and knots from when the yarn was purchased. The colors may differ slightly from the images. Please understand and acknowledge these points before purchasing.