I accidentally bought two sets and was told they can't be returned, so I'm getting rid of them. Purchased for 3,740 yen, completely unused and unopened. iROTEC Magnetic Quick Collar Olympic Type Black Set of 2, 50mm Diameter Collars (Fasteners) / Olympic Shaft Barbell Dumbbell Bench Press Barbell Shaft Plate Training Equipment Black plastic attachments for barbells, designed for durability. - Color: Black - Type: Barbell attachment - Brand: iPROTEC Thank you for looking.