Taking only about 50 yards of yarn, we recommend Cascade Yarns’ Ultra Pima Yarn because it is 100% cotton; washable, soft and affordable. A skein of Ultra Pima sells for about $11 and will make up to 5 knockers and the Ultra Pima Fine sells for about $6 a skein and makes up to 3 knockers depending on the sizes you are making. If using Ultra Pima Fine, we recommend using a 4 needle and making two sizes larger (meaning using a size D pattern you will end up with a size B knocker). The most requested colors are the “nude” and pastel colors. If you don’t have enough of one color to finish a knocker feel free to finish the inner piece with a complimentary color using the same type of yarn. If you get bored with the flesh tones by all means make a creative, bright pair if you want. We do get requests for those too . Don’t stress too much about the sizing. The most important thing is to make sure all pairs are the same size (same number of stitches). About 75% of the requests are for sizes B and C and the rest size A and D. We realize this is not the easiest pattern being knit on double point needles but they are beautifully contoured and hold up really well. Getting past the first few rounds is the most challenging but once mastered it becomes easy, fun and a portable project taking most people about 2-3 hours to make one. If you do not want to knit the nipple just CO 3 sts and go to the next row!