Based on our original version we made optimization on the structure of these foot anchors so that they produce even higher force (50%~200%+ higher). More importantly, the cost of these pro version foot anchors did not increase that much and this means that customers just need to pay almost the same price to get higher force foot anchors. Check out details here https://www.weizhongmagnetics.com/recess-former-pro-for-foot-anchor/