Preheat the oven to 375oF.
Cut the rolls in half horizontally. Spread the bottoms with the horseradish sauce and cover them with the roast beef.
Cut each Frigo® Cheese Heads® Pepper Jack String Wisconsin Snacking Cheese stick in half lengthwise and crosswise, yielding 4 pieces per stick, 24 pieces total. Then, place the cheese on top of the roast beef, two pieces per roll bottom.
Cover with the roll tops, wrap the sandwiches in foil and place them on a baking sheet. Bake 15–20 minutes, until the cheese is melted.
Remove them from the foil and enjoy.