I purchased two of these storage blocks. It would be great if they could figure a way to put the pen storage on all sides and make it swivel. I do like the blocks as it keeps the pens in sight on my desk and you can arrange the colors anyway that suits you. I lay my cubes on the side. I don't know how practical it would be if you had 75 or more pens, but I may add one more block and store the rest in another storage mode. It would be terrific if some had room to put two or more double deckers on a shelf or somewhere close to their working area. Great product!
It's great...but I'm going to need a couple more.