De or het touwring?

The correct Dutch article is:

de touwring

Rule Words ending in -ing: almost always de. See the rule

How to use touwring

the touwringde touwring
this touwringdeze touwring
that touwringdie touwring
our touwringonze touwring
your touwringjouw touwring
every touwringelke touwring
which touwring?welke touwring?
a big touwring / the big touwringeen grote touwring, de grote touwring