This ink cartridge three-pack contains one individual cartridge each of yellow

these standard ink cartridges can also be used to print text-based documents and yield up to 450 pages per cartridge

Can be used on all surfaces

these 13 1/2" x 13 1/2" envelopes do the job

They are suitable to use for displaying messages

Cold/Hot Gel Packs, Reusable, SAY523, Gel Pack, 36 Pack envy_121_e_all_in_one_950364|en_CA This ink cartridge three-pack containsReusable gel packs for cold and hot therapy. Can be placed in a freezer for cold treatment; or in hot water or microwave oven for fast heating. Always stays flexible. Non toxic