'a ' + (Blockly.BlockSvg.CORNER_RADIUS + 1) + ',' +
    (Blockly.BlockSvg.CORNER_RADIUS + 1) + ' 0 0,0 ' +
    (Blockly.BlockSvg.CORNER_RADIUS + 1) + ',' +
    (Blockly.BlockSvg.CORNER_RADIUS + 1);