A few of Dragon's newer kits, such as its Sherman M4A2 kit, include one-piece tracks made from 'Dragon Styrene 100' (DS), a plastic developed by Dragon's own Research and Development team. A cross breed of polystyrene and vinyl, DS is an attempt to combine the advantages of the two materials. Delicate details can be reproduced with DS using under-cut molding, reducing the number of small parts. The Tiger I hollow guide horns, for example, can be replicated on DS using slide-mold technology. These tracks can also be joined with normal plastic cement.