Shaker Snake's 4" Mixing Coils are specifically designed to fit a 20 oz "Blender Bottle" or any other shaker cup of similar size and shape. These mixing coils will also fit into a 28 oz shaker cup making them the perfect mixing coils for nearly evey occasion. That's exactly why we offer the 3-Pack, because everybody needs more than one Shaker Snake, right! Plus, order the 3-Pack and save yourself a dollar. This item includes three 4" Shaker Snake mixing coils, each measuring 1.75" at the base, 2.75" across the top, and 4" long.