The D’Addario Eco Ukulele Strap line features an eco-friendly soundhole hook style straps made specifically to support all ukuleles with a standard Soundhole. The full line is made from 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.