In the past week I have discovered that I like piping roses with the Wilton 150 piping tip, but I would like a larger version of it with a longer opening so that I can pipe larger roses. The length of the Wilton 150 opening is 0.45 inches. I would really like one with a length of about 0.6 inches. I have looked and all I can find with longer openings have "teeth" one side of the opening. I want both edges to be smooth. Does anyone know of a piping tip like this? Thanks.