I'm a complete sucker for anything that allows me to share my love of knitting on my knitting so I love these ribbed buttons from Katrinkles.
Katrinkles is based in Rhode Island so if you're in the USA and aren't ordering other items from us I recommend ordering directly from Katrinkles so they aren't crossing the Atlantic multiple times.
These buttons are made of 1/8" bamboo and are 3/4" wide. They come in cards of 4.
These buttons can go in the washer and the dryer, but as with most things made of natural materials, they will probably last longer if they are hand washed or if the item is dried flat.
Because they are made of a natural material, the appearance of each button may slightly vary.