There are multiple bands with this name: 1) Numbskull are a skate/thrash/grindcore band formed in Wellington, New Zealand in 2010. The original lineup consisted of JD on howls, Chris ReT on Axe and Oax on hammers. After some killer house parties they performed a handful of packed out gigs at SFBH supporting some of the local heroes. In early 2011 they added AK on Thunder.
Their sick-as-shit album, Powderslave, can be downloaded for free at http://numbskull.bandcamp.com.
They also have a facebook page, http://www.facebook.com/nvmbskvll.