Common replacement line diameters listed include about 0.065 inch, 0.080 inch (shown as .080 or 0.0800" in some listings), and 0.095 inch.
Some product listings advertise higher tensile strength, citing values around 100 lb tensile strength and contrasting that with older lines rated about 68 lb. These are manufacturer claims typically stated in the product description.
Spool caps are usually tool-less and designed to snap into place, securing the line and cover for quick replacement without extra tools.
Multi-packs often use 10-foot prewound spools and list totals such as 60 feet for a 6-pack; other options include much larger donut-style reels (for example, 160 feet).
Listings commonly advise consulting the owner's manual, provide part numbers, and include compatibility lists or model numbers for specific trimmer models.