You will need to wash your strawberries and dry them with paper towels or cloth; make sure they are very dry. If the strawberries have been refrigerated, let them get to room temperature before dipping. In a double boiler, add chocolate chips, corn syrup and butter, melt on medium heat, occasionally stirring. After it is melted, remove from the heat, dip 2/3 of strawberry in chocolate, let drip for a few seconds. Place the strawberries on sheet pan covered with wax paper or use the method under the tips. Put the dipped strawberries in refrigerator until they are firm, about 20 minutes.