Cat Unicorn Good Vs. Evil Unicorn Video Set Including Two Inflatable Vinyl Unicorn Horns, One White and One Black, and Wooden Video Clapperboard to Make Your Cat the Next Break-out Video Star Two Cat Unicorn Horns, each measuring 5  long with a four-point elastic strap system. Cats claim it is comfortable. Wooden clapperboard measures 4 x 3  (10 cm x 9 cm). You can even write your cats name in chalk (chalk not included). Great gag gift!