To be honest I only bought one of these shelves to start with. I read the description, looked at the pictures and decided I didn't want to spend too much money on a terrible shelf. Spring. Had to buy 3 more These racks are great! Lightweight yet strong, they hold tissue culture tubes perfectly. I can easily use a single tube or a full capacity rack and it doesn't seem to affect the stability of the rack! The only potential downside for some is that it doesn't hold the pipes at right angles. Your agar will have a slight slope if you take care of it. But I'm not for what I do! All in all great stands for 25mm tubes!
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