Feature:1. STIMULATING SPIKE DESIGN: The pointed outer layer of spiky massage ball provides stimulating effects that enhance circulation, perfect for relieving plantar fasciitis and foot soreness.2. TARGETED ACUPRESSURE: The 360 spiky floating point design targets acupressure points, relaxing tense muscles and providing a refreshing experience. The 4MM rounded edges allow for deep and effective massage targeting specific pressure points.3. DEEP TISSUE MASSAGE: Effectively stimulates pressure points to massage muscles deeply, awakening muscle vitality. Ideal for neck, back, and arm massages for overall relaxation and tension release.4. ENHANCED SENSATION: Acupressure massage with deep stimulation strengthens tactile sensation and alleviates soreness. The 360 spiky floating point design continues to target acupressure points, offering relief for tense muscles and a pleasant experience.5. ROBUST AND SAFE MATERIAL: Plantar fasciitis ball made from PVC material, ensuring durability, resistance to pressure, and safe usage for effective fascia relaxation and acupressure stimulation.Specification:Item Type: Spiky Massage BallMaterial: PVCSize: Approx. 11 x 4.5cm / 4.3 x 1.8in (manual measurement has some error)Hardness: hardUse: Fascia relaxation, acupoint stimulation, etc..Package List:4 x Massage Balls