Buy NFL Boasters, 4ct. at Michaels. com. Save your table and show your pride with a 4-piece set of boasters. These heavy-duty stainless steel drink coasters sport a laser-cut logo and a strong cork backing. Save your table and show your pride with a 4-piece set of boasters. These heavy-duty stainless steel drink coasters sport a laser-cut logo and a strong cork backing. They are great for fan caves and sports bars. Details: Available for a variety of teams 4" x 4" each 4 boasters Unique laser-cut design Officially licensed by the NFL Stainless steel; cork backing | NFL Boasters, 4ct. By Youthefan in San Francisco 49Ers | 4" x 4" | Michaels®