Can these balls be used in pitching machines?

No. Not on any type of pitching machine that I have seen the coaches use. These balls are too light and they are hollow.

What size is the ball

They are 9 inch circumference, the size of a baseball, not golf ball as others have stated.

Throwing against the wall, do thesae baseballs bounce back to you?

No, they are for batting practice.

Do these bounce well? Want to use for catcher blocking drills.

You can expect them to work better than traditional white whiffle balls, but similar. They are slightly heavier with better bounce. They would work well for catcher blocking drills.

ASIN	B015CK4JAO
Batteries Included	No
Color	ブラック
Customer Reviews	4.7 4.7 out of 5 stars (1,576)
Date First Available	February 22, 2016
Material	エチレン酢酸ビニル, 樹脂
Model Number	2762
Product Dimensions	1.75 x 1.75 x 1.75 cm; 4.54 g
Sport Type	野球
Use Object	ユニセックス(大人)

スキルズ(SKLZ) ボール 野球用 バッティング練習用 ミニ インパクト 【日本正規輸入品】 27627

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スキルズ(SKLZ) ボール野球用バッティング練習用ミニインパクト【日本正規輸入品】 27627