Size: 10ft Aluminum 6.35 mm 1/4 Inch Stereo Plug Male to 3.5 mm Stereo Jack Female Socket Headphone Extension Cable - 1ft Work for for 3.5 mm jack equipment, Mics and Headphones to be plugged into a 6.35 mm(1/4) stereo jack socket input
Material: Gold-plated, Made of copper wire inside
Cable Length: 0.3 m
Features: Durable design with flexible strain relief eliminates risk of damaging audio components. The extra cable length gives nice flexibility Both sides are not 1/4"; the adapter end (female) is 3.5 mm(1/8") while the jack (male) is 1/4"( 6.35 mm). Can you use this to listen to what your playing from your amp? Most headphones that will benefit from an amp will already have a 1/4" jack option built in but yeah, it should be fine. If you have high impedance headphones, or headphones that you want to add an extra kick to, using this adapter will work just fine.
Package include: 1 x 6.35 mm male to 3.5 mm female audio cable