Compact sizes: The injectors and pushers come in compact sizes that are discreet for storage and travel. Multiple colors: Includes 4 pieces in different colors (black, blue) for organization and to prevent mixing during use or cleaning. Convenient set: Includes 4 lubricant injectors, lubricant pushers, and washers in different colors for easy identification and cleaning. Smooth application: The injectors allow for precise, mess-free application of lubricant internally with the simple push of the pusher. Easy to use: No tools required just fill the injector with lubricant and push the plunger for quick, clean lubrication where needed.