This was my first purchase of Erlenmeyer flask rubber stoppers. WIDGETCO has very good prices and their website is very simple, straightforward, and fast to breeze through. Their website is particularly pleasant and easy on your eyes. The main reason I chose to order from WIDGETCO is that their shipping charge is extremely inexpensive. That is important to those of us who are just ordering one or 2 items. My order within just a couple of days. This was shocking considering their low shipping charge. Both the pure gum and the silicone rubber stoppers I ordered looked beautiful and perfect and fit perfectly in their vessels. WIDGETCO's customer service is far speedier and more exemplary than anyone could ever expect. I would look no further than this company for any product in their line and just recommended them to someone who will be using more of these sorts of items than I.