Should this quiver not be strengthenable? (that a word?!)

97%(97%) 100%m 100%mv 10847tnl (forest)(cloudy)> rem quiver
You stop using a quiver of razor sharp arrows.

<100%(100%) 100%m 100%mv 10847tnl (forest)(cloudy)> strengthen quiver
You can only strengthen armor, clothing, wearable treasures, or weapons.

<100%(100%) 100%m 100%mv 10847tnl (forest)(cloudy)> wear quiver
You wear a quiver of razor sharp arrows about your body.

It is leather too.