NUMSKULL Concept NUMSKULL Concept from Daniel Cram NUMSKULL Concept Experimenting with construction methods, for an ATV specific helmet design. View PDF View PDF View PDF View PDF gLike NUMSKULL Concept Experimenting with construction methods, for an ATV specific helmet design. Product Design Share R 7 n Available Freelance, Full-time Daniel Cram Sr. Industrial Designer San Jose, CA Follow Contact