The u shaped bra strap clips are made of plastic and prevent slipping of vests or bra straps while wearing sleeveless clothing. They are sewn into the garment in two sew-on holes in the shoulder area. Through the small opening on the lower side of the clip, a strap of up to 15 mm width can be pulled through and fixed smoothly. The Prym range includes the bra strap clips in packs of 12 pieces with 6 white and 6 black clips. They are washable up to 40 degrees.