Installing the lancet is quite easy. The pen-like shape helps me poke the finger to collect the blood easily and firmly.

These are good for lancing acne safely and effectively. Easy to use with the special holder that jabs you, instead of stabbing yourself. Good price and inexpensive per lancet.

The lancet folds like cheap aluminum and you’ll probably stab yourself like i did. They are too wide to protrude out to hit the skin and too flimsy. They don't work in a dario device.