If, however, they identify a specific bow by name, that particular bow does not become obligatory; it may be exchanged for another bow of the same type.

The difference between the two situations is as follows:
• One of the two competitors may be more skilled at shooting with one type than with the other; therefore, the second type cannot substitute for the type that was expressly named, whereas replacing one individual bow with another of the same type is permissible (1).
• In addition, the specified bow might break or there may be a need (2) to replace it.
• Moreover, skill does not generally vary (3) from one individual bow to another, whereas it does vary from one type to another.

Section
If they agree that one of them will shoot with an Arabian bow and the other with a Persian bow, or that one will use an olive-wood bow and the other a jarakh bow, and both are foot-bows, the agreement is valid according to al-Qāḍī and al-Shāfiʿī, as noted earlier (4). But if one of the bows is a hand-bow and the other a foot-bow, the agreement is invalid. The difference between the two cases is that in the first scenario they are two varieties of the same class (5)