any other suitable material when the piece to be produced is a ring the model is placed over an arbor 2 as depicted in fig1 the model 1 and arbor 2 are then placed within a master frame 3 the master frame 3 is preferably made out of metal such as an inexpensive easily tooled aluminum the master frame shown in fig2 has a first half 4 and a second half 5 each half 4 and 5 has an outer wall 20 an inner face 22 and a side wall 24 the inner face 22 of half 4 is intended to be placed in face to face registration with the inner face 22 of half 5 when the master frame is assembled as shown in fig2 as shown in fig4 the inner face 22 of each half includes a machined out arbor area 26 for receiving the arbor and a machined out center mold area 28 assembly of the two halves results in the creation of an arbor cavity formed by the two arbor areas 26 and a mold cavity formed by the two center mold areas 28 the master frame 3 also includes an injection port 34 extended into the mold cavity between the halves of the silicon molds 40 from the exterior of the master frame as shown in fig2 with the master frame 3 assembled around the arbor 2 and model 1 silicone 10 is poured through the port 34 the model and portions of the arbor located within the mold.