High-end guitar company Alembic Inc produced the Exploiter bass guitars for the late John Entwistle of the Who. These basses had the body shape of the Explorer with either a cone- or V-shaped headstock. The Exploiter is different in that the edges are rounded over and the lower bout cuts more deeply into the body than an Explorer. After Entwistle's death, Alembic released the "Spyder" based on John's custom basses, with production limited to 50 guitars. Warwick also produces the "Stryker" basses, based on the custom Explorer-style basses.