I'm looking for this style of microtube (ignore the filter). I think it's about 1.5-2mL, but I really am just interested in the base. Instead of a tapered/canonical bottom, it has a wide bottom. This is ideal for have a stirbar that doesn't get stuck, but I can't figure out where to order from, or what to search to specify we want this type of bottom, or even a wider obttom if possible.
Thanks