This bearing set makes a huge difference in terms of performance and stability. Especially for older kits like the TA01, you have to consider that the chassis is very old and parts are hard to come by. If you replace the old plastic and brass bushings with these stainless ball bearings you're doing a favour for yourself in maintenance down the line. These bearings won't do any harm or wear to the components because they are nearly friction free. A necessary upgrade for all TA01s.