The Otawog Systems mouse wrap is made of stainless steel and silicone. It gently and safely holds mice for tail vein injections, blood sampling or tattoo identification. Tilting the device allows for IP injections. Most importantly it adjusts to any size of mouse. It is calm and comforting, wrapping the whole mouse in a soft silicone snuggle. The mouse cannot turn around. The unit is easily cleaned and is fully autoclavable. The membrane is easily replaced.