The design is curved frogs with a constant radius through the curved leg of the turnout.
Guard rails are plastic.
Switch points appear to be formed sheet metal, which give them an unusual appearance. Space between open switch-point and stock rail is wider than necessary. That said however, Insulfrogs are popular among experienced enthusiasts. Wiring instructions are almost unnecessary and, provided locomotives are fitted with correct current collectors, perfect operation will be achieved. A layout using Electrofrog turnouts is slightly more conplicated to wire and therefore often suits the more experienced modeller.