EDGE-X – a multi-tasking cupping set used for stationary and dynamic cupping to help reduce pain, improve mobility, flexibility and athletic performance via myofascial decompression. Helps relieve common muscle & joint pain. Perfect for: A serious athlete, therapist or trainer for bilateral application. What You Get: 1 set of 4 stackable cups. Sizes: 1 X-Large (2.75"), 1 Large (2"), 1 Medium (1.5"), 1 Small (1.25") Material: Made with premium platinum cured silicone for superior suction, flexibility & control. Easy to squeeze and easy on your hands. Our cupping kits do not contain BPA, phthalates, PVC, or plastics. HOW TO USE Prior to cupping apply oil or emollient to clean skin for better seal or use in the shower with water and body wash. Compress the cup, apply to target area, release to create suction. STATIONARY cupping: leave on for 3-5 minutes. You may also lift & release, rotate the cup or move side to side. DYNAMIC cupping external glide (massage):