Designed to bring the quick-fire style of the Speed range to junior players, the HEAD IG Speed Jr. 21 boasts a supercharged black and white colour scheme, just like the racket Djokovic uses on court. The junior Speed range features Innegra technology, providing greater stability and reduced vibration (up to 17%!), while also lightening the frame to make it more comfortable for youngsters to swing. A DAMPPlus insert, meanwhile, stops vibrations from travelling up the grip into the arm, giving an accurate feel and further upping the comfort factor - it's all about making hitting the ball enjoyable and fun. At 200 grams unstrung, the Speed 21 is suitable for four to six-year-olds and features a closed 16/17 string pattern to assist in the generation of power.