These side and corner pieces are great for creating a finished look and to prevent tripping. They come in black and/or white only. * Each side pieces are 12" long and 4" inches wide. They can only interlock with eWonderWorld 12" x 12" or 24" x 24" mats. * These corner pieces come in pairs to create a perfect 90° angle. Each piece is 16" long by 4" inches wide. They can only interlock with eWonderWorld 12" x 12" or 24" x 24" mats. * Made from non-recycled, non-toxic, light weight, durable, and high density EVA foam. Due to the nature of foam production, colors may fluctuate slightly in various angles and/or lighting. * Have passed ASTM standards, including bite and choke tests, and 53 substances of very high concern screening. Will provide test reports upon request.