These 5 inch (13 cm) hand-crafted, patina tips are made of Moso bamboo. The copper, nickel-plated join is crimped and glued to ensure a secure connection. The size is laser imprinted on each tip. SPIN tips can be used with TWIST red cables as well as regular SPIN cables. Use small cables for 2 - 8 size tips. Use large cables for size 9 - 15 tips.