I used Zoya Beatrix for the base, it's a bright orange textured Pixiedust and my fav for basketballs. When I first did these, I used a black striper which you can buy pretty much anywhere these days. But I have found that it's so pigmented it always smeared when I used it...ALWAYS. (Like when adding topcoat). So I ditched it and use a striping brush now and regular black polish, which is available in pretty much any nail art kit or at a craft store...just look for a long skinny thin brush!
Direct link---------> https://instagram.com/p/3o2TegIQZU/