Cuesoul Engine V4 Darts – Steel Tip – 90% Tungsten – Hope Ring – Red – 21g. Welcome to the Cuesoul Engine range of darts. Expertly machined with unique high level of grip designs, they are coated in a black titanium finish with a blue ring incorporated in to the design. Each set also carrys an integrated coloured hope ring in the barrel design. Complete with colour matching integrated flights and shafts.