Arrow bracelets

Step 1

Start with the leftmost and rightmost strings and make forward knots (and backward knots, respectively) towards the middle as the picture above shows.

Step 2

If you've done it right, it will look about like this.

Step 3

Continue to make knots towards the middle, using the same pair of strings. When they meet in the middle, make either a forward- or backward knot, it doesn't matter.

Step 4

Repeat steps 1 to 4 until the bracelet is long enough.