SECTION: HOME; Features Desk; Part E; Pg. 7 About 55 million cases of bottled wine are sold in California each year. Of those, about 70% are closed with cork stoppers, 16% with metal screw tops and 14% with plastic, according to Amorim, the Portuguese cork supplier that runs the cork-reclamation group ReCork. Most wine stoppers are wrapped in "foil" that covers the top of the bottle, some of which is made from a mixture of lead and tin (on some older bottles, because that wrapper was banned in 1996 by the Food and Drug Administration); other covers are made from polylaminate aluminum and most from a heat-shrink plastic -- usually polyethylene or polyvinyl chloride, a.k.a. PVC.