简约风按摩健身运动球形商业照片

Solid black massage fascia ball, standard round sphere, uniform 3D round bump particles all over surface, muscle release rehabilitation fitness gear, matte flexible silicone material, non-slip raised grain, perfect symmetrical round shape, solid pure white background, full front eye-level close-up, centered composition, shadowless soft studio light, faint subtle shadow, 8K ultra HD physical therapy commercial photo, macro clear dense bump concave-convex texture, minimalist solid matte black tone, photorealistic massage ball