Advantages : 1. This set of front + rear magnet body posts are exclusively designed for the G-made Sawback GS01 and the latest G-made Sawback 4LS GM55000 . The magnets are selected in the size that best fit with the body posts frame in aluminum and the delrin nuts on top let you easily attach to the outer shell. 2. We use white delrin so that you can dye your own colors. 3. The G-made Sawback GS01 and the latest G-made Sawback 4LS GM55000 are exciting crawlers, you need to take off the shell for immediate fix for some parts inside, this magnet body posts can help you real quick to take it off in less than 2 seconds and after fixing the parts you can put it back again to racing.