CREATE TABLE table_34810 ("Year of Issue" FLOAT, "Description" TEXT, "Weight" TEXT, "Diameter" TEXT, "Thickness" TEXT, "Edge" TEXT)

Which Thickness has a Weight of 3.50grams?
SELECT "Thickness" FROM table_34810 WHERE "Weight" = '3.50grams'
SELECT "Thickness" FROM "table_34810" WHERE "Weight" = '3.50grams'