Xray aluminium countersunk shims
Xray introduce these countersunk aluminium shims for the use with the ballstuds on the company’s 1/8th off-road vehicles such as the XB9 and XT9. They come as 10-piece set and are made to prevent the ballcup from popping off in crash or during a hard landing.
Source: Xray [teamxray.com]