Are these reusable? Or do you need to buy a new pair when you change your trainers?

technically reusable but I found that I pull really hard on mine and I put a drop of super glue in the end and that would technically make them not reusable. technically reusable but since you will cut the ends off when you put the end cap on, you would need to burn the end of the lace to make them easy to re-lace through. so ... with all that said...technically yes but you will really get a new pair that will color match :)

What is "Black paperback"?

I think they are just the color black

I put the laces through the round part eithout pushing the button. Now the button won't push. Won't it supposed to”lock”?

You have to squeeze the button to put the leases through in the first place. Then when you let go of the button it locks the lease is in and you have to push it to open it each time. Pull the laces back out squeeze the button then put them through the new holes.

Tieless Elastic Shoe Laces | Desertcart Japan

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¥2877

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

👟 Unlock your speed and style—lace up without the hassle!

EVERYDAY EASE - Transforms any shoe into a sleek slip-on for busy lifestyles.
NEVER TIE AGAIN - Lock in your pace with no-fuss, no-tie convenience.
TRUSTED QUALITY - Globally loved with responsive support for peace of mind.
SLIP ON SLIP OFF - Elastic stretch lets you slide in and out effortlessly.
BUILT FOR PERFORMANCE - Heavy-duty locks hold tight through intense workouts.

RJ-Sport Tieless Elastic Shoe Laces combine heavy-duty locking mechanisms with elastic stretch fabric to deliver a no-tie, slip-on experience. Designed for athletes and everyday users alike, these durable laces ensure your shoes stay secure during intense activity while offering quick tension adjustment. Ideal for kids, adults, and seniors, they transform any sneaker into a convenient slip-on with a sleek black finish and trusted global quality.

Specifications

ASIN	B073SNKYJK
ASIN	B06XGRY2CS
Age Range Description	Kid
Apparel Fabric Stretch	Medium Stretch
Apparel Fabric Weight Class	Medium Weight
Best Sellers Rank	#1,273 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #5 in Shoelaces
Brand	RJ-Sport
Color	Number 001 - Solid Black
Customer Reviews	4.4 4.4 out of 5 stars (18,105)
Date First Available	March 8, 2017
Department	unisex-child
Fabric Type	Elastic
Garment Size Country	United States
Is Discontinued By Manufacturer	No
Item Length	120 Centimeters
Item Weight	33 Grams
Manufacturer	RJ-Sport
Manufacturer	RJ-Sport
Manufacturer Part Number	Elastic-Laces-DE-BLUS
Number of Pieces	2
Package Dimensions	2.3 x 2.3 x 0.75 inches; 1.2 ounces
Product Care Instructions	Wipe clean with a damp cloth
Size	One Size
Style Number	Elastic-Laces-DE-BLUS
Unit Count	1 Pack
material-fabric	Rubber

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