What are prayer bracelets?

Prayer bracelets are often used for prayer by Christians. They are usually woven so that they look like they have beads on them. There is a short prayer called "the Jesus prayer" that's about 2 sentences long that they keep repeating and the prayer bracelet has the same number of "beads" on it as the number of times they're supposed to repeat the prayer. So, a prayer bracelet is used to keep track of how many times you say it.