A double-thick 6.35 mm base, which is hard anodised and an Induction Compatible disc attached under high pressure to ensure a base that is permanent. Double thickness base, stays flat, spreads heat more evenly, suitable for Induction, gas and electric cooktops Hawkins Hevibase has a hard anodized black base that is permanent and heats quickly and evenly Made from pure virgin aluminum, exterior mirror polished Super-fast cooking; Improved pressure regulator - saves more fuel Inside-fitting safety lid will not open until pressure falls.