The ball used in the rubber-ball version of baseball, which is made of rubber and has a hollow center; the material is softer than a standard hard baseball.

Equipment used to read from and write data to floppy disks; commonly abbreviated to [[软碟|軟碟|ruan3 die2]] in Taiwan.

A type of tennis played with a soft rubber ball; it follows similar rules and scoring to standard tennis but uses different tactics.