Synthetic poly trainers are designed for practising various types of martial arts forms. These pieces are built for contact use and are made from a variety of man-made rubbers, plastics or polypropylene. The poly sword, knife and weapon trainers are some of the most durable trainers available on the market today and are quickly replacing the traditional wood trainers found in many dojo and self defence training classes. There is also a growing number of styles available to compliment your persona for live action role playing (larp).