The image shows insulated wire ferrules, each color-coded for different wire sizes (cross-sectional area), which correlates to different current-carry ing capacities. Here's a general reference table based on DIN standards (used in most of the world, especially Europe): Note: These values are approximate and depend on wire insulation, temperature rating, installation environment, etc. Always follow local electrical codes (NEC, IEC, etc.) for precise sizing and current rating. If you're using these for a specific project, I can help you pick the right size based on your wire gauge or amp needs. Just let me know!