he D’Addario Eco-Comfort Ukulele Strap line is an eco-friendly soundhole hook style strap made specifically to support all Ukuleles with a standard soundhole. The full line is made from an Eco-Friendly fabric, made from recycled water bottles, and is super comfortable while also being super durable with a color scheme inspired by beach elements. The hook is made from a soft rubber that will not harm or scratch your ukulele but is strong enough to support the weight of the instrument.