The suffix 级 (jí) 'level / grade' attaches to nouns to form adjectives meaning 'X-class / X-level': 国家级 'national-level', 世界级 'world-class', 大师级 'master-class', 国宝级 'national-treasure level'. Modifies the following noun directly: 大师级演奏 'master-class performance'.
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Strong praise — use sparingly, otherwise it sounds like marketing copy. In sports and esports, 大师级 often translates the actual rank 'grandmaster' (as in chess GM titles or video-game ranking tiers like Overwatch's Grandmaster).
