The HART .065" Line & Spool in Blue is a set of 4 spools designed to fit most auto-feed string trimmers. These spools are compatible with HART brand trimmers and are powered by batteries, making them convenient for outdoor maintenance tasks. The model, HAC4065VNM, ensures a reliable fit and function for your gardening needs. Easy to install and use, these spools are a practical choice for keeping your yard and garden looking neat and well-maintained.