You are purchasing Sapim Laser double butted spokes in black.
The Sapim Laser is a great spoke for lighter riders that are around 75kg or less. It is reasonably priced and offers good bump absorption due to its butted design.
The Laser spoke is best used on wheels where the rider is less than 75kg and weight is more an issue than strength.
Building with Lasers should only be undertaken by experienced wheel builders and the middle section of the spoke needs particular care. You may have to use a pliers to hold the spoke to prevent the spokes from winding up.
I’m able to offer these in 1mm increments from 210mm to 310mm.
Here are the tech specs for these spokes:
Weight: (64 pcs x 260 mm lg) 273 g
Quality: AISI 302
Strength on middle section: 1500 N/mm2