The PlayMakar(R) Pro Self Adhering Electrodes features a high performance snap style electrode pads which gives you the flexibility. Pads come in small and large sizes help you tailor the proper pad to the muscle group you are targeting. Get 20-30 sessions up to twenty minutes out of each pad. Features Pads come in large and small sizes ideal for large or small muscle groups Patented structural composition and hydrogel properties that provide the ultimate stimulation Electrodes conduct subtle electrical impulses that help to stimulate your muscle and provide maximum contraction Uncompromising Adhesion, Performance & Longevity Flexible Fabric Layer Contours Better to Your Body No natural latex Includes: Small 2.75" x 2.75" Pads / Large 2.75" x 4" Pads