Brand New but open box item without 1/4" adapter plug.
Roland product info:

The RH-5 headphones are perfect for electronic musical instruments such as Roland’s digital pianos and V-Drums. Equipped with high-performance drivers and large-scale housings, these headphones provide quality sound and a comfortable fit. From musical-instrument practice to audio-playback applications, RH-5 delivers exceptional performance.

Equipped with high-performance φ40mm drivers for dynamic, quality sound
Provides a natural, flat response that’s balanced across the frequency spectrum
Large-scale, lightweight design for secure and comfortable fit