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SEGMENT INFORMATION - Net sales by product (Details) - BRL (R$) R$ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Net sales by products |  |  |  |  |
Net sales | R$ 7,995,673 | R$ 6,665,082 | R$ 14,976,466 | R$ 12,364,081 | R$ 12,364,081
Market pulp |  |  |  |  |
Net sales by products |  |  |  |  |
Net sales |  |  | R$ 12,862,936 | R$ 10,055,757 |
Fluff pulp |  |  |  |  |
Net sales by products |  |  |  |  |
Percentage of total net sales |  |  | 0.60% | 0.60% |
Printing and writing paper |  |  |  |  |
Net sales by products |  |  |  |  |
Net sales |  |  | R$ 1,661,611 | R$ 1,902,733 |
Tissue |  |  |  |  |
Net sales by products |  |  |  |  |
Percentage of total net sales |  |  | 2.60% | 2.60% |
Paperboard |  |  |  |  |
Net sales by products |  |  |  |  |
Net sales |  |  | R$ 430,292 | R$ 382,440 |
Others |  |  |  |  |
Net sales by products |  |  |  |  |
Net sales |  |  | R$ 21,627 | R$ 23,151 |

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