CAUTION PROPERHANDLINGOFTHE FINECARTRIDGES Handle the FINE Cartridges of this product properly, observing the cautions noted below. Improper handling causes malfunction or other problems in the product, as well as damage to the FINE Cartridges. Note:
1) When you install the FINE cartridges in the product, insert the FINE Cartridges into the FINE Cartridge Holder carefully not to knock them against the sides of the holder. Also be sure to install them in a well-lit environment. For details, refer to your setup sheet.
2) Do not attempt to disassemble or modify the FINE cartridges.
3) Do not handle the FINE Cartridges roughly such as applying them excessive pressure or dropping them.
4) Do not rinse or wipe the FINE Cartridges.
5) Once you have installed the FINE Cartridges, do not remove them unnecessarily.
(Taken from Canon Inc. 2008 - Printed in Vietnam)
The pronoun them in the sentence ".insert the FINE Cartridges into the FINE Cartridge Holder carefully not to knock them against the sides of the holder" (lines 8-10) refers to: