✅ BLACK KF94 MASK: The KF94 mask filters out most airborne particles, protecting users from breathing in tiny particles down to 0.4um in diameter. KF94 offers significant protection over normal blue 4 ply masks. ✅ OUTSTANDING QUALITY CONTROL: Produced by the company specialized in mask manufacturing: Using the High Quality Filter (MB) recognized for its excellent technical skills as textile and fabric ✅ COMFORTABLE MASK DESIGN: 3D Tri-folding Stereoscopic Design: Our mask covers not only the res