The pieces may come a little dusty with cuts that are not perfect. The actual silicone will be fine for use.  They are mixed box and we have tried to include "a bit of everything" across the range. Please dont ask us whats in each box. Please dont complain you didn't receive what you "hoped" you would receive or that it doesnt look exactly like the picture. Its 30 couplers for a fraction of the price thy would retail at.