There is a wide range of weights out there for standard straight bars. Typically, beginners start at around 15kg, give or take. We have 15kg bars geared for beginners with a width of 25mm rather than 27mm, which is more ideal for smaller hands.
Olympic barbells, like those used competitively, are often 20kg, and they can come in a few different materials. Our higher quality bars are hardened chrome which prevents chipping. They also feature bearings that allow the plates not to 'grab’ while rotating. Our cheaper 20kg bars are a standard chrome and have bushes rather than bearings.