17 PCS: Each pack contains 7 dice, so you can use for a long time. If you drop one or has one dice broken, you do not have to worry about not enough. 2Balance Rolling: Dice are perfectly balanced, which will not roll to one side and as long as you get the strength right, can be throw in a steady, balanced way. Making the game absolutely fair. 3Suitable: You can play various types of tabletop games with dice, such as role playing games, board games. Dice is also for study or education for kids and children. 4Resin Material: Polyhedral dice is strong abrasion resistance, corrosion resistant, damage resistant, has a stable performance. The colorful resin material also makes dice more exquisite. 5Best Gift: The dice is in fine workmanship. If your friend loves playing board games, you could give to friends, sisters,and family as a great gift.