This product is either discontinued or we cannot get that from suppliers.
Qnap CAB-TBT305M-40G-LINTES, Cable Type Thunderbolt 3, Data Transfer Cable, 6.56 ft, Connector On First End 1 x USB Type C Male Thunderbolt 3, Connector On Second End 1 x USB Type C Male Thunderbolt 3, Data Transfer Rate 5 GB/s, Data transfer rate (max) 40 Gbit/s.
The 6.6' Thunderbolt 3 Cable from QNAP offers high-speed data transfers of high-definition video and audio between Thunderbolt 3-equipped devices at bi-directional speeds of up to 40 Gb/s.