96-Place Flipper Microtube Rack (5 Racks) - Durable Reversible Fluorescent Rack to Accommodate Popular Tube Sizes - Chemically Resistant Polypropylene Tubes - Laboratory Equipment

Too wide to sit flat in the tray, but they work, holes were either too big or too small for the tubes we use.

Works just like one should. Well made and durable.

Nice, simple four-way tube racks. Good quality, bright colors.