Jonard Tools’ 42 mm × 3.4 mm x 1.6 mm Ribbon Fiber Protective Sleeves are designed to provide maximum protection and long-term reliability for fusion-spliced fiber optic connections. These high-performance sleeves ensure precise alignment, superior mechanical strength, and complete environmental sealing for each splice. Constructed with a durable outer heat-shrink tube, an inner adhesive layer, and a ceramic strength member, these sleeves maintain splice integrity while minimizing optical loss. Their compact diameter makes them ideal for high-density splice trays and applications requiring minimal space without sacrificing protection.