Haven't seen AT type belts or pulleys on T-bots
They are all in the same area, http://www.technobotsonline.com/pull...ing-belts.html
http://www.technobotsonline.com/pull...g-pulleys.html
MFA T5 belts are heavier duty than the Synchroflex T5 belts. AT5 belts can transmit something like 3 times as much power as a T5 belt and the pulleys are the same length.

Choosing the right pulley / belt combination for an application saves wasted effort and money. We frequently have to take it on the chin when we get complaints from customers such as why we cannot bore out a 12mm hole in a pulley with 10mm dia boss.

PJ, What you are told may not always be correct - Plus I was advised that T-bots belts are crap as you may well find their selection of parts was not appropriate for their application. We sell plenty of pulleys and belts and get very few complaints.

If anyone needs assistance with any products from Technobots before or after purchase, then simply use the Q & A tab to post a question which can be found with every product.