i tryed this, i found they were quite good and gave me a good idea of the size i wanted, however as the implant with be inside ur breast on not on top like the rice boob means it will be a tiny bit smaller and also the shape of the implant in lace will look diffrent and be a diffrent shape. but i do advise to give it a goas it will give u an idea but i didnt find this fully acurate, hope this helps xx