The Strap Wrist and controller are sold by separately, you need to buy both.

For Nintendo Switch JoyCon Controller Console Pair Wireless Gamepad 
Property:
Ideal replacement for original Switch Controller Joypad.
These Switch Joypad controllers can be used with Switch, Switch Lite, and Switch OLED.
Sensor - Both the left an d right joypad have a 6-axis gyroscope. This allows you to get a more realistic gaming experience, more accurate strokes, and more fantastic controls. These switch joypad controllers can play many games like Zelda, Mario, Pokemon, and more.
This joypad controller supports the wake-up function. You just need to press the HOME button for a few seconds to light up your switch. The controller also has a capture function. When you play games, press the record button to capture your great moment and share it with your friends.

New Replacement Not an original one.

Without Strap Wrist 

Includes:
1 Left Switch Controller
1 Right Switch Controller

Or

1 Pair of Strap Wrist