Yellow ones are a tad softer/lighter than the red ones, but still bloody hurt if you get hit.
Man up!
Nothing like getting hit with a real cricket ball, I've absolutely belted one into a bloke's face at very short range in a game and he was fine once he'd got over the shock ha.
@Woodyspin Maybe, they work well bowling off a short run like indoors and to bat against, feel very different to bowl with off a proper run due to the lightness though. Pretty sure the league gets them direct from India in bulk, don't know where you can buy them in the UK.