This bundles includes four Hercules GS414B Plus Auto Grip System Guitar Stands. 

From Hercules:

The HERCULES Guitar Stand GS414B PLUS features the upgraded Auto Grip System (AGS) yoke, Instant Height Adjustment Clutch and Specially Formulated Foam (SFF) rubber on all contact points.

• The upgraded Auto Grip System accommodates a wider range of string instrument neck sizes from 40mm-52mm (1.57 in – 2.05 in).
• The included NINA™(Narrow Instrument Neck Adjustment) is specially designed to increase the thickness of AGS arms to hold instrument neck sizes as narrow as 28mm(1.10 in).
• Easier adjustment, the Instant Height Adjustment Clutch with locking pin adjusts stand height in a snap!
• Stronger grip on surfaces, the upgraded Foot Pads increase ground friction to provide maximum security for your instrument.