FLX® is the new Next-Gen UHMWPE fiber with color embedded directly into its structure, specially designed for manufacturing all types of archery bowstrings and servings. 
New solid colors. FLX® offers a    smooth,     slick finish    in solid, non-coated colors that stay consistent over time,      maintaining a like-new appearance even after extended use. With a     tight, uniform finish, the FLX® serving     leaves no residue on your winder or tab,    won’t stain recurve or longbows, and    treats your limbs with care.Is not that awesome?

Coating has traditionally been used to color threads and servings for bowstrings and cables. It is an    external layer that does    not penetrate the fiber, and in addition to offering a     broad range of colors,     it preserves the fiber’s grip properties.