These are sold as sixs
"This hook works with shock cord or elastic band.Works with 2.5mm to 3mm line."
The above quoted wording is straight from Dutchware's team. Watch Dutch showing off the Line Lock Hook.
Free Hook (six)
£2.64Price
Material: Acetal (also known as Polyoxymethylene (POM)
Weight – 1.1 gramsW - 11.3mm
L - 24.1mm
H - 9.1mm