Description:Material: PlasticColor: BlackHeight: approx 4.5cm / 1.77 inchHole inner diameter: approx 5cm / 1.97 inchMade of solid plastic， durable and long lastingQuick release， not easy to slidePerfect for crossfit workouts， Olympic lifts， overhead press，deadlifts，bench press， and so onPackage Includes:1 x Pair of barbell collars