The bracelet string is made of high quality strong & stretchy rubber material,It will not break even if it bears 5 kg of weight. <br> <br>Material: elastic plastic rubber <br>Cord Shape: round <br>Measurement: 0.8mm in diameter <br> <br>Package includes: <br>20 rolls of crystal strings, 8 m/26 ft each, with a total length of 160 m/525 ft. <br> <br>If you are not satisfied with your purchase. Please do not hesitate to contact us, we will get you back within 24 hours and we will do whatever it takes to make it right. 30 day no questions asked FULL refund & 100% Satisfaction Guarantees.