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.

ASIN	B073SNKYJK
Best Sellers Rank	#186,686 in Shoes & Handbags ( See Top 100 in Shoes & Handbags ) #1,358 in Shoe Laces
Customer Reviews	4.4 4.4 out of 5 stars (14,818)
Date First Available	2 November 2017
Department	unisex-child
Is Discontinued By Manufacturer	No
Item Weight	33 g
Item model number	Elastic-Laces-DE-BLUS
Manufacturer	RJ-Sport
Net Quantity	1 Pack
Package Dimensions	7.6 x 5.9 x 1.9 cm; 33 g

RJ-Sport Tieless Elastic Shoe Laces - Heavy Duty No Tie Shoelaces for Kids and Adult with Strong Lock and Speed Shoestrings

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