21. The Israelis usually respond with tear gas, percussion grenades, rubber, or hard rubber -covered steel bullets. 22. I'm self-conscious when I hug anybody because they feel like these hard rubber balls ." 23. A hard rubber tire on a bicycle is just as rideable but is bone jarring. 24. A hard rubber ring is used instead of a puck, and the players'sticks have no blades. 25. When reheated hard rubber exhibits shape-memory effect and can be fairly easy reshaped within certain limits. 26. Some are relatively lightweight plastic while others are thicker plastic, hard rubber , aluminum or heavy brass. 27. Ditto sheets of hard rubber more than an inch ( 2 . 5 centimeters ) thick. 28. Spectators place bets on jai alai players, who hurl a hard rubber ball from wicker baskets. 29. All of the bases were attached to the seat using hard rubber disks to allow flexibility. 30. It was manufactured with hard rubber grips.
