こう性能 せいのう爆薬 ばくやくじゃないです
kōseinō baku yakujanaidesu

Noun
Desu Copula
Negation Auxiliary

The polite negative form of 高性能爆薬

1. It's not high-performance explosives.; It isn't high-performance explosives.

Negative
Polite
Casual Register