Here is an updated version of the very basic square knot friendship bracelet. I use 2 string colors and a third color is woven in with 6/0 seed beads! For fun, I made this in Halloween colors. Hope you enjoy!

1mm Nylon String
2x 22 inch (color 1) (56 centimeters)
1x 40 inch (color 1) (101 centimeters)
1x 40 inch (color 2) (101 centimeters)
1x 10 inch (color 2) (25 centimeters)

6/0 seed beads (I think I used about 18)
scissors
lighter
ruler
strong hold tape