Works well; arrived super quickly; needs better description
I was looking for one-way straws for my mother, who is quadriplegic, so that when she drinks the liquid will stay in the straw.  However, every one-way straw I found had a diameter too wide for her preference.  These select flow valves were our best shot at being able to have our desired effect on the straws she presently uses.  I saw these first on the ARK website.  There, they have the option to buy in packs of 3 and up.  However, this listing on amazon does not outline how many you will receive for the price.  I needed them quickly; so, I bit the bullet and purchased them, as a prime member, not knowing how many would arrive for the price.  I was pleasantly surprised to find 3 were sent for my purchase price (which I believe was just under $8, including shipping).  I was also pleasantly surprised by how quickly they arrived.  I selected two-day shipping, but these arrived at my door the next day - and early in the morning!  Kudos!<br /><br />In order to fit well on a straw, the straws diameter should be at least 3/16" wide.  My mother uses a more narrow straw (1/8"), and as such these valves to do not fit well.  Again, how they are used and how large the device is is not outlined in the product description.  Instructions for use are provided in the packaging, but it would be nice to see in the product's description before buying.<br /><br />Having said all of that, they do work well and for their intended purpose provided the straw is large enough, and again, the shipping was super fast!
Rating: 4 stars