Materials

Tough Pitch Electrolytic Copper - preferably silver bearing such as Alloy 116, which has 25-30 oz. of silver per metric ton for strength and heat resistance.

Segment Mica - usually alkyd vinyl, which uses a low resin content and small mica splittings. Paper mica products may also be used in some cases.

Mica V-Rings - made of molding mica which has a higher resin content and larger mica flakes for moldability.

Glass Tape - used for banding extensions on v-ring commutators and to band grooves on glassbands.

Steel - used in steel hubs and caps, typically re-used in refill commutators but fabricated new in OEM or damaged units.