【Product Features】 ・10mm thick, providing excellent cushioning and soundproofing. ・Class 1 soundproofing specification, safe for children and pets. ・Heat-retaining and compatible with floor heating. ・Made of non-formaldehyde material for safety. ・Includes side parts for a clean look. ・Color: Gray 【Set Contents】 ・Joint mat body: 17 pieces ・Side parts: Included 【Condition】 Used for about 4 months, with no noticeable stains or scratches. 【Size/Specifications】 ・Per piece: Approximately 59 x 59cm ・Thickness: Approximately 10mm ・Material: PE resin Thank you for viewing! This is a set of 17 joint mats (large size 59cm) made by Tansu no Gen.