This is a holder/mount for a Wahoo speed sensor, specially shaped for the profile of a DT Swiss (rebranded Shutter Precision) PL-7 dynamo hub.
I attached a patch of 2mm self adhesive EPDM-Foam to the bottom side of the sensor to help reduce vibrationa and rattle noise.
The holder with inserted sensor is fixed to the dynamo hub with two black 2,5mm x 1,6mm x 200mm cable ties.
The author marked this model as their own original creation.