ball is part of:

ball contains:

Full expansion for ball:
   100%  #1 Technic Axle w/ Ball
   100%  #1 Technic Friction Peg w/ Ball
   100%  Ball w/ Clip
   100%  Ball w/ Round Stud
   100%  1x4 Plate w/ Side Ball
   100%  2x2 Plate w/ Side Ball
   100%  3x3x3 DUPLO Ball for Tubes
    90%  PRIMO Shake & Roll Surprise Ball
    90%  1x2 Plate w/ Triangular Beam & Ball
    90%  3L Technic Piston Rod w/ Ball & Stud
    50%  Opening Scoop w/ Yellow Ball
    10%  2x6x5 DUPLO Tube Frame w/ Green Door
    10%  4x4 DUPLO Tube Segment