Less than half of the specified size [SEP] The specified size of the stone is 4.3 x 2.8 x 1.4inch.  The actual size is 3.5 x 2.125 x 1.0inch, only 44% of specification.  This is way beyond any margin of error in the manufacturing process.  You should also note the estimated delivery date.  Although it says "prime free shipping,"  it took a week to arrive in first class mail.