Most RPGs use attributes to describe characters’ physical and mental characteristics, for example their strength or wisdom. Many games also include social characteristics as well, for example a character's natural charisma or physical appearance. They often influence the chance to succeed in a skill or other tests by addition to a die roll or by determining the number of dice to be thrown. As a consequence, usually a higher number is better, and ranges can be as small as 1–5 (for numbers of dice) or as great as 1–100 (when adding to results of percentile dice). In some games, attributes represent linearly increasing ability (e.g. in "Tunnels and Trolls", where a character can lift 10 lbs per point of Strength) whereas in others a small increase can represent a major gain in ability (e.g. in the "DC Heroes"/"Blood of Heroes" system, where +1 to Strength doubles a character's lifting capacity).