Modison Group of Companies manufactures Button Contact - Nickel / Cupro Nickel Backed Contacts. Modison Group of Companies is an ISO 9001:2000 certified company. Button Contact - Nickel / Cupro Nickel Backed Contacts have facing of silver with base made up of cupro-nickel. The contacts are specially processed to make the silver facing hard and wear resistant. Button Contact - Nickel / Cupro Nickel Backed Contacts has a cupro-nickel base that makes it easier for welding of these contacts on different types of contact carrier.