These are cello adjuster screws with clear crystals that shine blue. The multi-faceted crystals sparkle elegantly, adding a subtle touch of style without being ostentatious. The screw tops feature V-cut rhinestones, and the bases are adorned with crystal glass (crystal blue). The beautifully polygon-cut bases are designed in a button shape for easy turning. Adjustone Crystal (Set of 4 Cello Adjuster Screws) Top: * Preciosa Tanzanite Base: * Crystal glass, polygon-cut * Crystal blue, with metallic coating to reflect light Screw diameter: M3 * Confirmed to fit most cello tailpieces (e.g., Wittner, Bois d'Harmonie, Bogaro & Clemente, Accuacoustic). Each piece is carefully finished by hand. We support your playing by adding premium screws to your instrument! Please be careful when replacing the screws. The instrument and tailpiece shown in the photos are not included. #チェロ #cello #adjustone