It seems like those are for bags and backpacks. Coats, jackets etc might slip from rounded wide hook.

I didn't see the the most popular colour - (off)white.

Usually I buy hooks for towels and those benefit from 2-3 hooks on single mount.

Also I usually never buy hooks only, I buy them fitting to other furniture or space.

If I were you, I'd become a supplier to bigger store. Alternatively I'd adjust the design for custom mounts for popular models of light transport (scooters, ebikes)