These are "Shining Adjusters," featuring Swarovski crystals decorating the top of L-shaped adjuster screws. SWAROVSKI Light Rose Shimmer (pink with a shimmer effect) is applied. This is a shimmer effect that appeared in Swarovski in 2018. "Shimmer" means sparkle, and the effect is a "polarized effect with a thinness that allows the base color to be seen through." It's similar to the Aurora (AB) coating, but it has a transparency that reflects the color of the base glass more. You'll feel a glamorous impression with the polarized coating on the surface. The screws can be replaced with the screws of the L-shaped adjusters currently used on violins and violas (Wittner, Stradpet, etc.). Screw diameter: JIS M2 Made of steel (gold-plated), with a pointed tip. Crystal: Swarovski Flat Back Light Rose Shimmer ss20 This product is an adjuster with screws. The tailpiece and instrument are not included. When replacing the adjuster screws, it is recommended to protect the instrument with a cloth or similar to prevent scratches. May your violin's sound resonate like the shining light of the crystals. Thank you for viewing.