Prices differ for different pool sizes .solid pvc pool safety cover reinforced with aluminium poles and tension ratchets, which can hold a weight of up to 100kg.the pvc pool cover with poles is easy to handle, as the childproof tension ratchets make is easy to release or apply tension and the supporting beams make is easy to fold the cover up. this heavy duty safety cover is designed to protect children and pets from drowning by accidental falls in the pool. the bolts we use are removable quality screw bolts, which can be removed when the cover is not in use, to prevent tripping.