In a paddles' completed form, the rubbers have already been attached to the blade, so the bat is ready to use. Typically the blade and rubbers are of lower quality, and sell for a cheaper price than the custom-made paddles more experienced players use (where the blade and rubbers are purchased separately, and glued together by the player).
Pre-made paddles are usually used by beginners and recreational players, but are generally replaced by custom-made paddles once a player begins to take the sport seriously and wants to produce more spin and speed on his strokes.

