A pair of the last collars you will ever need to buy. A spin lock design secures your weights on the bar with ease. Compatible with almost any barbell or implement. A heavy duty plastic material and steel insert, the pair weighs 1.5lbs.  These will make a great addition to any home, commercial, high school or college weight room. Also sporting a limited lifetime warranty for manufacturer or workmanship defects. With 35 years of history in weight rooms across the country. We stand behind our product. We know you will too.