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.

Rj Sport Tieless Elastic Shoe Laces

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Description

⚡ Lace up, lock in, and never look back!

CUSTOM STRETCH FIT COMFORT - Elastic design adapts perfectly to your foot shape, reducing pressure points for all-day performance.
UNIVERSAL FIT FOR ALL AGES - One size fits toddlers to adults—perfect for athletes, seniors, and kids alike.
NEVER TIE AGAIN RUN FASTER - Skip the hassle of knots and stay ahead in every race or daily hustle with instant lock laces.
HEAVY DUTY LOCKING MECHANISM - Strong, durable lock keeps laces secure through every marathon, trail, or playground sprint.
EFFORTLESS INSTALLATION CARE - Quick to install, machine washable, and built to last—upgrade your shoes in minutes.

RJ-Sport Tieless Elastic Shoe Laces offer a heavy-duty, no-tie solution with a secure locking mechanism and elastic stretch fit. Designed for all ages and activities, these durable black laces provide comfort, convenience, and a custom fit, making them ideal for runners, seniors, and kids. Machine washable and easy to install, they eliminate the need to tie laces while ensuring a reliable hold.

Specifications

ASIN	B073SNKYJK
ASIN	B0DDCVDG86
Age Range Description	Adult
Apparel Fabric Stretch	Medium Stretch
Apparel Fabric Weight Class	Heavyweight
Best Sellers Rank	4,255 in Fashion ( See Top 100 in Fashion ) 52 in Shoe Laces
Brand	RJ-Sport
Colour	Number 001 - Solid Black
Country Of Origin	China
Customer Reviews	4.4 4.4 out of 5 stars (14,740)
Customer reviews	4.4 4.4 out of 5 stars (14,740)
Date First Available	16 Aug. 2024
Fabric Type	Elastic
Garment Size Country	Great Britain
Item Length	120 Centimetres
Item Weight	33 Grams
Manufacturer	RJ-Sport
Manufacturer part number	Elastic-Laces-DE-BLUS
Model number	Elastic-Laces-DE-BLUS
Number of Items	1
Number of Pieces	2
Product Care Instructions	Machine washable, air dry, do not iron or bleach.
Size	One Size
Unit Count	1.0 count
material-type	Rubber

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