At Les Garçons, we are great fans of the ChiaoGoo interchangeable needles. These 5″ / 13 cm precisely-machined needle tips are made of surgical stainless steel. The size is laser imprinted on each tip, and doesn't fade. Even better: every ChiaoGoo product carries a product lifetime warranty from manufacturing defect! (The warranty does NOT cover normal wear and tear, misuse or abuse.)
Note about the connectors: