This double wave friendship bracelet pattern is made up of yellow wax cord and black wax cord, it is not difficult but you need patience and some supplies: yellow wax cord, black wax cord, iron scissors and a lighter. Take a 100cm yellow wax cord and a 100cm black wax cord, put them together and take another 100cm yellow cord, put it under the two wax cords where is 30cm away from the top end of the two cords. Then fold the upper wax cords down, the 30cm cords will be the axis, and it is decided by your wrist circumference. Tie a half square knot with sideward yellow cords and tighten. Read the whole tutorial here.