HIGH QUALITY MATERIAL. Adopting high quality material and exquisite workmanship, the differential cup is durable and anti-corrosion for long term use. GREAT REPLACEMENT. It is a great replacement accessory for upgrading your RC model car. EASY INSTALL. The differential reduction joint cup is easy to install and remove. Also, 4pcs per each which is practical and convenient to replace. APPLICATION. This RC parts is specially designed for A949 A959 A969 A979 K929. Item Type: RC Accessory Compatible With: For A949 A959 A969 A979 K929 Quantity: 4PCS/Set Colour:red Material:Aluminum alloy Size:2cm long Package Contents: 4*Differential Cup Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.