Mould for casting the form.
However, after the first casting I decided that if shifting the concave portion a little further to the front will allow the object to sit more comfortably into a hand. So a new mould will have to be made. Also trying to figure out a way to allow my object to be removed from the mould easier, it takes so much force to remove each time. Vaseline does not seem to be helping too much. I am thinking about making some cuts to give the plastic more room to bend.