LYINIE premium electrode pads, made of reusable medical-grade gel with soft foam backing, are durable, comfortable and gently adhere to your skin. Tens unit pads are designed to adhere to all areas of the body, perfect to treat pain in the lower back, shoulder, hip/thigh, upper arm/elbow, ankle/foot, calf, knee, sciatic, tennis elbow, tendonitis, sore muscles and much more. The long-life pads can be reused up to 20-30 times if stored and used properly. Compatible: only compatible with Omron TENS units model PM3030 PM3029 PM3031 PM3032 HVF128 Feature: 1. Pre-gelled, adhesive pads are easy and convenient to use 2. Medical-grade material, non-irritating 3. Flexibly conforms to all body areas for multiple pains 4. Self-adhesive, reusable, durable. 5. Strong adhesion with skin, no allergy, stimulation, residue and reliable physical and chemical properties. 6. Size : 2.51 inches H x 3.82 inches W.