Greases are usually in a tube or tub, so that they can be applied through the use of a grease gun or other tool. Greases are higher viscosity, semi-solid materials, with thickeners to hold the grease in place which allows for long term, harsh-condition lubrication. Liquid lubricants do not typically contain thickening materials like greases, allowing them to be a less viscous, flow-able liquid. Liquid lubricants can be sprayed from a can or squirted out through a dropper bottle. Either way, they are easily applied in tight spaces and are less visible than a grease would be. This makes lubricants useful for many indoor and outdoor applications.