Each refill holds 3.0 ounces, which is 300+ sprays. Use these refills with the following brands; Downtown Pet Supply, Gentle Spray, Spray Commander, Spray Barrier and Virtual Fence spray products. It contains a citronella mixture that is 100% safe for people, animals and the environment. Citronella is an essential oil that derives from lemon grass. The propellant is the ozone friendly. Satisfaction Guaranteed. BRAND: Downtown Pet Supply

• Citronella refill canisters for No Bark collar
• Each 3 oz can contains approx 300 sprays
• Safe and Effective for humans and animals, Ozone friendly