The D 'Addario echo-comfort ukulele strap line is an eco-friendly sound hole hook style strap made specifically to support all ukuleles with a standard sound hole. 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. D 'Addario is known for innovative, problem-solving, quality musical accessories, offering a complete line of award-winning accessories including cables, picks, tuners, capos, straps, humidifiers, maintenance tools and more.