For professionals who find the 52.5° sponge of the BlueStar A1 too firm or prefer a softer option, the BlueStar A2 and BlueStar A3 are perfect alternatives. The BlueStar A2 features a 50° sponge, while the BlueStar A3 offers a 47.5° sponge, both utilizing the same advanced Optimised Energy Sponge (OPTE) technology known for its superior elasticity and shock absorption. The meticulous development, production, and processing of the BlueStar series meet the highest standards, making these rubbers a top choice for serious players. With their slightly softer sponges, the BlueStar A2 and A3 are ideal for advanced and professional players seeking optimal performance and comfort.