The VERTPAC-SDR100 which utilizes our popular VTX 3-tier TDR-3 rack, is a favorite of high schools because of its ability to store a full 20 pair run of dumbbells – 5 thru 100 lbs, in 5 lb jumps – in a relatively small workout space. In this package, it’s loaded with our VTX institutional grade octagonal rubber (SD-R) dumbbells.