im thinking of the really small ones.
like this
http://www.google.com/imgres?start=225&um=1&hl=en&sa=N&biw=1920&bih=949&tbm=isch&tbnid=RsBMNpR451140M:&imgrefurl=http://removablewalldecals.info/product/hot-wheels-monster-jam-dalmatian-monster-mutt-truck-1-64-scale&docid=pOoqTdRgm1zAmM&imgurl=http://images.wikia.com/hotwheels/images/c/c4/MonsterMuttDal.jpg&w=730&h=617&ei=UEJ_T97XDMLWiALuu4WHAw&zoom=1&iact=hc&vpx=1314&vpy=536&dur=2859&hovh=206&hovw=244&tx=138&ty=140&sig=114948073812265160049&page=5&tbnh=138&tbnw=171&ndsp=55&ved=1t:429,r:24,s:225,i:113