Nispira activated charcoal odor filter refills deodorizers compatible with Simplehuman filter case for trash cans or refrigerator Using activated charcoal to absorb unfavorable trash odor and VOCs. Dimension: 0.5" x 4.3" x 3.1". Simply install the refills into the filter case. 4 Filters included. Suggest to replace each filter every 3 months. All Natural – Non-toxic. Activated carbon is biodegradable 100% customer satisfaction guaranteed. Quality meets or exceeds leading national brand Nispira activated charcoal odor filter refills deodorizers compatible with Simplehuman filter case for trash cans or refrigerator. Using activated charcoal to absorb unfavorable trash odor and VOCs. Simply install the refills into the filter case. 4 Filters included. Suggest to replace each filter every 3 months.