They are not aluminum! They are plastic.
I got them on May 21. The last one broke this weekend (aug. 26,2017) after 4 or 5 uses. One the swivel popped off completely and the second you can see the spring doesn't work. Money down the drain!!
|商品尺寸||15 x 35 x 67 毫米|
|型号 / 款号||CamJam® Cord Tightener - 4 pack - Black Plastic|
|包装清单||CamJam® Cord Tightener - 4 pack - Black Plastic|