The Emerson "wave shaped opening feature" is a fast, effective, and impressive way to open your knife.

The patented Emerson "wave shaped feature," a small wave-shaped tab on the top of the blade that's built to catch on your pocket seam, opens the knife as you withdraw it from your pocket. This instant-open feature is a favorite among military, rescue, and law enforcement knife users.

But it does take a little practice. 

Enter the Kershaw-Emerson E-Train, our “Emerson trainer” knife. The blade is unsharpened so you can safely practice using the “wave shaped opening feature” without endangering either your pocket or your fingers.

The E-Train’s G10 front scale is in “safe-training blue” for easy identification. There's a left/right reversible pocketclip so you can easily carry it with you to train whenever you have a spare moment.

Features:

Designed by Emerson, built by Kershaw
Unsharpened trainer model
Thumb disk; "waved shaped opening feature"
Manual opening
Reversible pocketclip (left/right, tip-up)
Lanyard hole
Steel: 3Cr13, stonewashed finish
Handle: G10 front, 410 stainless steel bead-blasted back
Blade Length: 3.2 in. (8.1 cm), unsharpened
Closed Length: 4.5 in. (11.4 cm)
Overall Length: 7.7 in. (19.6 cm)
Weight: 5.1 oz. (146 g)