This is a set of 13 nylon strings for kendama. These nylon strings are made with tightly woven, high-quality material that is durable and less prone to breaking. (Cheaper strings tend to break easily.) The thickness is 1mm (the standard thickness for kendama strings). The length is approximately 65cm when cut. (It will stretch slightly with use.) Colors available are: black, white, red, blue, light blue, turquoise, hot pink, yellow, light green, purple, cherry blossom pink, brown, and green. These strings are made of the same material as the strings used on kendamas approved by the Japan Kendama Association. You can even use these strings to compete in Japan Kendama Association tournaments. Buying strings at a kendama shop costs about 160 yen per string, excluding shipping, so this is a great deal. They will be shipped in an envelope. Thank you. Also, if you purchase a kendama or additional kendama strings that I am selling, I can offer a discount. (These items will be shipped together.) Please consider this. Have a nice kendama days!!