They are. They are printed on vinyl with an abrasive vinyl overlay on top of the print.

How well would these stick onto concrete? I really don't want to keep replacing them.

It’s definitely a tough good adhesive that’s on them but like anything, trying to stick to rough concrete is tough... I’d say these are the best I’ve used if that helps...

Where are these made to be installed? On the vinyl in the pool? On the concrete outside surrounding the pool? Where?

These are normally installed on the concrete decking outside of the pool. They are installed st each depth of the pool. Ex. If the pool is 3ft on each end and 5 ft in the center, you would put a 3ft marker on the end of each side of the pool, and 5ft markers in the center on each side of the pool. Commonly an International No-Diving marker is put along side each of the Ft markers.

Brand	Aquatic Custom Tile
Material Type	Vinyl
Number of Items	1
Size	1 Pack
Product Dimensions	15.24 x 15.24 x 1.02 cm; 59 g
Shredded Shape	Waterproof
Application type	Swimming Pool Deck

Aquatic Custom Tiles, 5' Pool Depth Marker, 6" x 6" Vinyl Pool Sticker, Pool Number Marker, Pool Safety Sign, Adhesive Pool Depth Marker Sticker for Deck, Made in USA - (1 Pack)

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