imagine benching and rewracking 225 and then as you are about to get up the barbell comes flying down on your head, neck, chest. I know you will be happy with the size, operation and price of this device. I used Diana Kralls, Departure Bay, Elton Johns Someone Saved My Life, Bill Champlins Sara, and Chicagos God Save The Queen for testing. I had thought all along that the LVL 50 was a compromise over my wired set, its not. I accidentally pulled one of the laces out of the tab. They are comfortable and sound very good. It comes with everything you need although I ended up using my own mallet as the wooden mallet that it comes with didnt have enough umph. buy u won?t be disappointed these are lightweight, easy to put on, good in the pool and much better for my feet than flip-flops, especially for something like water aerobics. The shelves could be used to house anything.