 WENZHOU, China, Aug. 26, 2021 PRNewswire -- ZK International Group Co., Ltd. Nasdaq: ZKIN ZKIN, ZK International or the Company has formed a wholly owned subsidiary, xSigma Collectibles Limited xSigma, and entered into a partnership agreement with Maxim to launch MaximNFT.com, the exclusive NFT Non-Fungible Token Marketplace of the iconic mens lifestyle brand. 