【3-Step Assembly】The installation of this martial punching bag is easy peasy lemon squeezy with only 3 step: 1.screw the 12 suction cups; 2.add water or sand to the base; 3. align the heavy bag to the base and fix with screws. 【Pre-filled Bag】GYMAX punching bag is prefilled, and you could start your exercise ASAP you get it. Multi-layer construction of the bag offer you touch-friendly punching, quick rebound and shock-absorbing effect. 【Freestanding with Base】Can be filled with 110 lbs sand or 100 lbs of water, this stably standing boxing bag needs no hanger or attachments. Moreover, 12 powerful suction cups on bottom improve overall stability, leaving you no worries about violent boxing or kicking. 【Safe & Silent】Equipped with TRP shock absorbers, 4 springs, and a silencing layer, this adult punching bag reduces stress to your ankle and lower workout noise, perfect for apartment or condos. 【Perfect Home Gym Addition】Exercise height from 25” to 70”, this heavy punching bag is suitable for teens and adults, and no matter your aim is practicing boxing skills, losing weight or keeping daily workout, this box punching bag would meet your needs. (There is a tray at the bottom, please do not kick)