Vintage 1994 Pampered Chef Springform Pan Set

Vintage 1994 Pampered Chef Springform Pan Set, never used. Set includes one Springform flat base, one fluted ring base, one heart insert and one outer collar. Also comes with the recipe/instruction booklet. There is some blackened discoloration around the fluted ring base, I have tried cleaning it with Barkeeper‘s Friend, but there is still some discoloration (see photos). Otherwise this is in good vintage condition.