Garden Shears

Material A
Steel. The shears themselves are mostly created with strong steels or other metals.

Disposal: Steel can be recycled. Due to the size of garden shears, however it would be best to leave them curbside for collection or to bring them to a drop-off depot for proper disposal.

Material B
Plastic. The handles are normally made out of hard plastics in conjunction with rubber to provide a steady grip.

Disposal: The handles have to be placed in the garbage bin, although the handles are most likely going to be stuck to the shears themselves. In which case, it would be best to bring them to a drop-off depot for proper disposal.

Best Alternative
Garden shears are not necessarily detrimental to the environment. The metal of the shears can be broken down and reused for another purpose.