Equestrian Helmet, Boots, and Chaps Set with Bonus (Book)

I purchased this to attend a riding club and used it about 4 times. I stored it carefully in case I resumed riding.
It has been used only a few times and is in beautiful condition with no noticeable scratches, dirt, or loss of shape (personal opinion).

Set Contents:
① Helmet
Light Sports Room Co., Ltd. Riding Helmet
Size: 57 cm
Color: Brown

② Chaps
Suede half chaps
Size: M
Color: Black

③ Short Boots
Size: 37 (24 cm)
Color: Black
While there are no signs of loss of shape or noticeable scratches, there is some age-related deterioration.

Bonus:
How-to book Let's Start Horse Riding

I would prefer to sell this as a set, but if sold individually:
Helmet: ¥2,300
Chaps: ¥2,300
Boots: ¥2,000
Book: ¥300