[3] It is made from high-strength, high-impact ABS plastic[4] and is still distributed by C & S Security Inc. as "Black Box" handcuff cover.

[5] Other companies sell similar devices, e.g. CTS Thompson ("Blue Box" handcuff cover) or Sisco restraints.

[7] When using a handcuff cover in combination with a belly chain, the hands may be cuffed in a parallel or in a stacked position.

[7] As the handcuff cover provides a rigid structure, the individual's wrists may be bruised or cocked, restricting blood circulation.

[7] However, some models come with angled ends which allows hands and arms to relax in an appropriate posture, therefore reducing physical stress on the individual being transported.