Hi, Jane. Cathe uses the Troy Lite Barbell set. The bar like you said is 5 lbs. The set consists of (1) lite bar, (2) spring collars, (4) 2.5 lb. plates, (2) 5 lb. plates, and (2) 7.5 lb. plates (40 lbs. total weight).
You can buy more plates separately as you need them. Here's the link to the...