Please note that this item comes from Xiaomi Eco-chain Cooperation, so there is no Xiaomi logo on it. This replacement filters are for Purely Reusable Electric KN95 Fresh Air Mask. Each pack contains 30 pieces of filters (10 mask filters + 20 fresh air filters) KN95 level protection; effectively blocks mist and particles. It can blocks dust and PM2.5 particles especially during haze season with efficiency up to 99% thanks to its nano-fiber filtering technology. Specification: ===================================== Color: White+Blue Material: Cotton Feature: Breathable Product weight: 0.050 kg Package weight: 0.060 kg Product size (L x W x H): 3.0 x 2.0 x 0.2cm / 2.95 x 1.46 x 0.49 inches Package size (L x W x H): 4.00 x3.00 x 0.30cm / 5.91 x 4.72 x 1.18 inches