carapace, pod, eggshell, plate, casing, blast, scale, strafe, Racing shell, sheeling, more...

core, center, interior, inside, heart

clam, oyster, mussel, scallop, abalone, conch, nautilus, snail, cockle, more...

outer, empty, hard, thin, spherical, tortoise, cylindrical, inner, inch, white, hollow

petro canada rival,   petrol brand,   outer covering,   pea pod used-to-be,   useful crust,   unfilled pie crust,   firework component,   hard outer layer,   metal casing,   tough exterior,   common taco feature,   edible husk