Simply attach ZLOKZ to your original shoelaces. No more tying shoelaces! The color is black silver (metallic black). We have plenty of stock. If you are purchasing multiple items, please comment with the color and quantity. If you agree with the total amount in the reply, we will edit this listing and create a dedicated listing for you in black silver. Normally, we ship via Nekopos, so it will fit in your mailbox. There are various ways to attach them, from simple methods to methods suitable for athletes. They are also used by various professional athletes. Please check the ZLOKZ official website for more details: www.zlokz.co.jp Since being introduced on NHK's "Machikado Joho Shitsu" on March 7, 2014, it has become popular. Once you wear them, thanks to ZLOKZ, they won't loosen or come undone. But they are easy to take on and off! One-touch operation. Compared to rival screw-type capsules, ZILOKZ can be quickly removed with one hand, while capsule types require both hands. It's a hassle, so you end up wearing them loosely. Compared to rubber laces with knobs, rubber laces are easier to adjust the tension. However, ZLOKZ has overwhelming hold and durability for competitive use. There are no springs or buttons, and no moving parts, so they won't break. Even if your shoes wear out, you can use ZLOKZ on your next pair. ZLOKZ also doesn't interfere with the design of your shoes. From professional athletes to runners, walkers, and various sports enthusiasts, as well as those who work on their feet and take their shoes on and off frequently, are using them. In sports scenes, users say things like, "Always the same tension," "Never comes undone during play," and "I can concentrate on the game." In everyday life, users say things like, "Easy to take on and off," "Doesn't tire me out even when traveling," "The laces look neat and cool," and "The lace tips don't touch the ground, so it's clean." To avoid fatigue and improve performance, it's important to tighten your shoelaces properly. ZLOKZ is an excellent product that makes this easy. The package includes one pair of ZLOKZ and instructions.