Stricter Screening & Smaller Tolerances
ITTF Standards:
– Weight tolerance: 2.67g to 2.77g
– Roundness tolerance: <0.25mm
– Hardness tolerance: 0.68 to 0.81mm
DJ40+ balls(for Olympics) tolerances compared to ITTF standards:
– Weight tolerance: 20%
– Roundness tolerance: 25%
– Hardness tolerance: 30%
DJ40+ balls(for WTT) tolerances compared to ITTF standards:
– Weight tolerance: 30%
– Roundness tolerance: 35%
– Hardness tolerance: 46%