These are all plastic snap hooks. They come in several different styles and sizes. Lanyard NOT included.
A - Large Swivel Snap Hook - 63mm long, 26mm opening
B - Large Non-Swivel Snap Hook - 35mm long, 20mm opening
C - Medium Non-Swivel Snap Hook - 42mm long, 13mm opening
D - Medium Non-Swivel Snap Hook - 38mm long, 4.5mm opening
E - Small Non-Swivel Snap Hook - 34mm long, 7mm opening
F - X-Small Non-Swivel Snap Hook - 27mm long, 13mm opening