Well made cups
Bought these to replace cups that were in a cupping kit.  The original cups had orange plastic tops.  Poorly constructed as cracks would develop along the valve area and the cups would no longer hold suction.  Received these after a long shipping time (which the company said was going to happen - no surprise).  They seem to be thicker.  The black plastic valve also appears to be more substantial.  I am hoping that they last longer than the originals.  So far (over a month) they are as good as new.
Rating: 4 stars