Package includes: 4 pieces M18.5 faucet bubblers for replacement and 1 faucet bubbler removal key. This set meets daily replacement needs. Standard size: 0.73 inches / 18.5 mm male thread diameter. Universal replacement part. Please measure the tap size before purchase. Material and construction: the removal key is made of durable ABS and is sturdy and not easy to break. The bubbler includes a fine filter to keep water flow stable and splashing-free. Splash prevention and filtration: the bubbler has a waterproof seal on the outside to prevent water from splashing to the side. Each bubbler features fine mesh holes to reduce water impact, the flow mixes with air to create numerous bubbles and minimize splashing, and the built-in three-layer filter removes most impurities. Use scenarios: - Home kitchen or apartment sink replacement to reduce splashing and stabilize flow. - Office break room or shared kitchenette where multiple users benefit from a consistent stream. - RV, camper, or other mobile setups with standard 18.5 mm taps needing reliable, universal replacement parts.