Different climbing conditions can be achieved by removing the number of counterweights on the front and rear wheels. e.g. fully dismounted (0 counterweights), half mounted (3 counterweights), fully mounted (6 counterweights). for 1/24 1/18 RC crawler SCX24 & AX24 & FCX24 & FCX18 & CR18P hobbyplus 1/18 FMS 1:24 FMS 1:18 EASYRC 1/18. Your guys crawler car' front and rear can have different weights, and can be adjusted and matched at will according to the usage scenario Quick disassembly and assembly features, each counterweight unit can be disassembled individually. Full Brass for increased vehicle weight, heavy-duty, for better crawling performance. Colour:Titanium Color Material:Metal Package Contents: 4x Wheel Rims 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.