The aluminum material has better stability, is not easy to deform, and the data makes the gear run more stably and smoothly. The aluminum has good thermal conductivity and can play a role in heat dissipation. Fine workmanship and perfect style. Easy to install and durable in use. High Wear-resistant and durability. and high quality. Name:for -4 Aluminum Medium Wave Box Set Material: aluminum Type: modified and upgraded accessories Color: Red Weight: about 68 grams. Applicable to -4 Size: 6.5 x 6 x 4cm Package Contents: 1 x RC Car wave box shell assembly 1 x RC Car screw fittings 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.