This all inclusive gag harness and blindfold is superb for slave training.

The sub is not going to wriggle out of this harness; constructed of leather with 4 straps: 1 strap for over the head, 2 straps for behind the head and 1 strap for the chin.
The inside of the blindfold is soft cotton and will provide a comfortable fit.
The red ball gag has a nice 1 1/2" diameter.