There are many methods for producing selvages. The recipient tears off and discards the perforated selvages to open the card. Thicker selvages are also more difficult to sew through. The selvages consist of up to ten warp threads. The sides or selvages are usually overcast in wool. The selvages are reinforced over 3-4 warp cords. Many types of selvages have been developed, with different elastic and ornamental properties. Most selvages are narrow, but some may be as wide as . Knitting selvages makes the fabric easier to sew together than it would be otherwise.