The Roland KD-85K is a high-quality electronic drum pad using a REMOG head, compatible with the V-Drums series. - Brand: Roland - Model: KD-85K - Type: Electronic drum pad - Material: REMOG head - Features: V-Drums series - Stand: Included The sensitivity has slightly deteriorated due to years of use. A 4mm hex wrench is required for assembly. I played it the other day, and there were no particular problems with the sound. However, as it is a used item, the sensitivity is slightly diminished. I sincerely apologize, but please understand that returns are not accepted, and the item is sold as-is. Thank you for viewing.