1 extra Ring & Riser for the Tomato Tower, as the plant grows, add extra risers and rings or use them to cover with a plastic bag to create a mini greenhouse.
There is also a trellis option which allows you to train your plants in a tight spiral increasing the density of your growing space, see below.
This is a trellis kit that attaches to the tomato tower, it allows you to train the tomato plant to go in a tight spiral, it also provides more stability for the tower. There are enough clips and netting for 2 tomato tower pots both with an extra ring.
Specially designed pieces of clear perspex, which increase the stability of the tomatoe tower by bracing, ie restricting the movement of the central riser at the base.