Can they be used for attaching card stock to card stock for card making?

Probably but they are very strong so if you want the pieces to detach it might rip paper or light cardstock.

Is this 500 pk a set or individual rounds? Im looking for 500 sets meaning 500 hooks and 500 loops, total 1000 pcs or 500 set?

500 circles, which is 250 pairs

Will they stick to a black out curtai? Will the velcro give or the glue on the curtain give?

Yes, a black out curtain should hold without problems. I would suggest using at least 12 dots however.

Is this 500 pairs or 250 pairs?

According to the Velcro product page, this package contains 500 sets of the hook and loop 3/4 inch diameter “coins” to use the Velcro parlance. I bought these to attach LED replacement lights in ceiling pot light cans and they worked great. They held well, were not visible and are make it easy to change the LED light down the road. Hope that helps!

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Sticky Back Dots with Adhesive, 5/8 in, Black, 80 Pack

Product ID: 179504861

Details

Brand
VELCRO Brand
Color
Black
Material
Nylon Rubber
Size
80Pk
Style
VELCRO Brand

📏5/8 inch pre-cut perfect size

🖤80 durable black vinyl coins

🧲Strong adhesive for smooth surfaces

€ 17.22

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Description

🖤 Stick with the best—VELCRO coins that hold your world together!

SLEEK DISCREET - Black vinyl coins blend seamlessly with any décor or workspace.
LONG LASTING HOLD - Adhesive bond strengthens over 24 hours for reliable, everyday use.
BULK PACK CONVENIENCE - 80 pre-cut coins ensure you never run out during your next big project.
VERSATILE APPLICATION - Ideal for home, office, classroom, and creative projects on glass, metal, wood, and plastic.
EFFORTLESS ORGANIZATION - Peel, stick, and secure your space in seconds—no tools needed.

VELCRO Brand Sticky Back Hook and Loop Fasteners come as 80 black vinyl 5/8 inch coins with a strong adhesive designed for smooth surfaces like glass, metal, and wood. Perfect for organizing, mounting, and crafting in home, office, or classroom settings, these pre-cut fasteners offer a durable, no-sew solution that reaches full strength after 24 hours.

Specifications

Brand	VELCRO Brand
Color	Black
Material	vinyl
Size	80Pk
Style	Coins
Mounting Type	Adhesive
Manufacturer	VELCRO Brand
Part Number	VEL-30164-USA
Item Weight	1.2 ounces
Package Dimensions	7.17 x 5.2 x 0.67 inches
Country of Origin	Mexico
Item model number	VEL-30164-USA
Pattern	Dots
Item Package Quantity	1
Included Components	80 Circles Black
Batteries Required?	No

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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€ 17.22

Duties & taxes included

In stock

Sold byAmazon NetherlandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Netherlands.

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