Carolina Gym Supply Part-Time Ninja BlocksThe Carolina Gym Supply Part Time Ninja Blocks are the best "quad steps" on the market! Larger than the competition, sturdier, and with more hook loop fastener to lend itself to more uses. You'll be able to use these shapes for your preschool, rec, and lower level classes in addition to your parkour classes! The Carolina Gym Supply Part Time Ninja Blocks are sold as a pair of wedges so that two wedges equal one block. MIX AND MATCH! The Part Time